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The Gospel of Barnabas: Medieval Forgery, or Something Older Underneath?

Historical argument

Picture a manuscript that surfaces many centuries after the events it claims to describe. It’s written in Italian, presented in the name of one of Jesus’s own followers, and it overturns almost everything the mainstream Christian tradition teaches. No Trinity (the doctrine that God is three persons — Father, Son, and Holy Spirit — in one being), a blistering attack on the apostle Paul, and a crucifixion scene where someone else dies in Jesus’s place. That’s the Gospel of Barnabas.

Most scholars who study it reach the same verdict about where it came from: forgery. Late medieval, the thinking usually goes, or early modern at the very earliest — which would leave it with little to tell us about the earliest centuries of Christianity.

That verdict sounds tidy. But pull it apart, and it isn’t built on a single, solid proof. It’s stitched together out of several different kinds of evidence, and those threads sort into three loose families.

The first family is about the manuscripts themselves. Scholars call a surviving copy of a text a “witness” — and Barnabas has only two: one in Italian, one in Spanish, and both are late. Nobody currently knows of an unbroken ownership trail connecting either one back through the centuries.[32]

The second family looks inward, at features inside the text: things claimed to be anachronisms (details that don’t fit the era they’re supposed to describe), echoes of a special kind of blended Gospel text called a Gospel harmony (we’ll get to that), and literary parallels. To these, add references to currency and mentions of a religious “jubilee” year.[5] Small details that, added up, are said to smell more like later Europe than first-century Judea.

The third family is about plausibility, plain and simple. A Gospel this firmly anti-Trinitarian, whose ideas often line up comfortably with the Qur’an and with the wider Abrahamic tradition (the shared family of faiths — Judaism, Christianity, and Islam — that trace back to the patriarch Abraham). A text like that strikes many readers as a late piece of religious argument. Maybe written by a Morisco (a Muslim in Spain forced to convert to Christianity — more on them shortly), maybe by a Muslim writer more generally, maybe by a Christian working sometime after the Middle Ages.

So here’s the real question worth chasing: do these three families of evidence actually show that the whole work began life as a late fake? Or do they point toward something messier — a longer history of copying, translating, and editing than the forgery theory allows for?

A Book That Attacked Paul and the Church — So Why Did Almost Nobody Notice?

There is also a period reading of the silence. In that century, controlled texts moved less through print than through secretaries and collectors into private libraries, and a book living on shelves may never have produced the kind of public event an Inquisition file records. The documented cases of that archive-and-leak culture — from Poggio to Bessarion — are set out on the Historical Hypothesis page.

Here's a puzzle that rarely gets asked out loud. If a book had entered real circulation in Europe — a book that named and criticized Paul, rejected the Church's own account of the crucifixion, denied the Trinity, and challenged the Church's authority outright — you'd expect it to have left a mark. A denunciation. An order to suppress it. An investigation. Some kind of paper trail sitting in an archive somewhere. The archives themselves are anything but empty — trials, denunciations, banned-book lists, decade after decade of paperwork. For this book, the file is almost empty. Before weighing what that silence means, first take in the world such a book would have had to cross.

A World Without Walls: Muslims, Christians, and Jews Living Side by Side

This part of the story never happened inside sealed religious compartments. Muslims, Christians, and Jews lived alongside each other — often peacefully, for long stretches — in markets, along trade routes, in the day-to-day traffic of ordinary life. Ideas crossed those lines constantly. So did manuscripts.[25][27]

Look at the map for a moment. For long periods, the Ottoman Empire stretched across the Balkans and deep into Hungary, reaching almost to Vienna. That made for a vast zone of shared frontiers, mixed populations, trade, rivalry, and constant contact, with the empire itself standing at its center as one of the great powers of the age.

Historical map · Ottoman world around 1683 Map of the Ottoman Empire at its greatest territorial extent in 1683, distinguishing directly administered lands from vassal and autonomous territories.
This is a political map, not a map of who lived where — coexistence never meant equality, and it certainly didn't mean the absence of conflict. But everyday proximity was a basic fact of life across this space, from Syria and Lebanon through Anatolia and the Balkans to Ottoman Hungary. Cities like Istanbul, Salonica, Sofia, and market towns across what's now Bosnia and Herzegovina — Sarajevo and Mostar among them — are some of the clearest examples: places where Muslims and Christians, and in Istanbul and Salonica large Jewish communities too, met constantly in markets, courts, trades, and streets, and sometimes in the same neighborhoods.[52][53][54] Map: Chamboz, Wikimedia Commons, CC BY-SA 4.0; based on historical studies cited on the file page.

That contact wasn't only political — it showed up in music, architecture, ornament, folklore, and popular religious expression. Even Christian Arabic translations of the Bible didn't develop in a sealed room. They picked up color from their surroundings, in language and style, and at times could sound strikingly Qur'anic in tone.[26] And religious identity wasn't fixed for life, either — conversion was a familiar feature of that world, and it can't be reduced to coercion alone.[27]

Folio from an Arabic Gospel manuscript (Walters MS W.592), copied in Egypt in 1684, in naskh script with red rubrics and an illuminated, floral headpiece. Arabic Gospels, Walters Art Museum, MS W.592 (CC0).
Page from a bilingual Coptic–Arabic book of prayers, 17th–18th century, with Arabic script and decorative ornament. Coptic–Arabic book of prayers, The Met / Wikimedia (CC0 / Public Domain).
Christians living under Islamic rule often gave their own Gospel and prayer manuscripts an Arabic, almost Qur'an-like appearance, in script, illumination, and ornament.

If the Gospel of Barnabas had entered wide circulation in a world like this, it would have had plenty of chances to attract attention, carried along networks of contact, curiosity, rivalry, and debate, reaching readers with very different interests. And Barnabas wouldn't necessarily have been a unique case, either: history offers many examples of banned books crossing political and religious frontiers instead of staying wherever the authorities tried to confine them (the references for this article note five such cases).[28] Had Barnabas circulated steadily along the frontier between Europe and the Ottoman world, its near-absence from the surviving polemical and religious record would still need explaining.

Morisco readers, in particular, would have had an obvious reason to be interested in a Gospel understood to predict the coming of the Prophet Muhammad. And yet clear evidence that they possessed or used the surviving text remains elusive.

So What Does the Morisco Connection Actually Show?

One popular theory holds that the Gospel of Barnabas was invented by Moriscos — Muslims of post-Reconquista Spain, forced into baptism and eventually expelled. The evidence for it is thin: a friar named Fra Marino is said to have walked a copy out of the Vatican around 1585–1590.[1] The earliest Morisco reference to it is a single sentence, written around 1634 by the exile Ibrahim al-Taybili in Tunis: y asi mesmo en Elanjelio de San Barnabé donde se hallará luz — Likewise, in the Gospel of Saint Barnabas light will be found there.[2] That's the whole case: one line, one exile, forty years after the fact.

And Tunis is exactly where the theory runs into trouble. Between 1609 and 1614, ships had carried hundreds of thousands of expelled Moriscos into precisely this frontier world — Tunis, the wider Maghreb, Ottoman lands — where anti-Christian polemic was a live genre, and circulating such a text would have cost these exiles nothing. If Moriscos had written a Gospel built to argue for Prophet Muhammad, this is where it should have surfaced. Instead, even a Morisco writer living right there produces exactly one sentence — a title in passing, not a text being used.

Language points the same way: the surviving Gospel is Italian, not the Spanish, Arabic, or aljamiado that Morisco religious writing normally used.[2][34][35] A 1998 edition of the Spanish manuscript[22] let the scholar Jan Joosten trace signs that it was itself translated from Italian, not the other way around.[1]

That is the Morisco evidence in full. The next step is deciding what a silence like that can and can't prove.

What Does This Silence Actually Tell Us?

Put those threads together, and the conclusion narrows. The evidence we have doesn't fit the more dramatic popular picture: a polemical weapon, invented by Muslims, then wielded against Christians again and again across several centuries. The record shows nothing of the kind.

But that's a narrower claim than it might sound. To say Muslims apparently didn't know the surviving text is one thing. To say a Gospel under Barnabas's name had no earlier existence anywhere in the Christian world is something else entirely — and there's evidence against that stronger claim. A Gospel under Barnabas's name appears to have been known, at least by title, well back in the early Christian catalogue tradition. A source called the Decretum Gelasianum (an early Christian list of approved and rejected texts, traditionally tied to a pope named Gelasius) includes an entry for “the Gospel in the name of Barnabas, apocryphal”.[3] Apocryphal there means outside the official collection — not automatically “fake,” just “not included.”

That entry can't identify the ancient title with the Italian text that survives today — and neither can a related catalogue known as the List of the Sixty Books. But neither notice is irrelevant. Together they show that a Barnabas-titled Gospel was already a known name in the Christian catalogue tradition of late antiquity — long before the Middle Ages, let alone the Italian manuscript we now have.

Set against how thin the surviving work's public trail is, these old notices are reason enough to dig further — to ask whether the later Italian text preserves some thread of a much older Barnabas tradition.

It might look easy to call the Gospel of Barnabas a Muslim fabrication. But the strongest version of that theory still has to explain how a book like this would have circulated, and why its public, polemical footprint stayed so thin before it was widely published and translated in the modern era. Pushed that far, Muslim fabrication alone starts to buckle as a complete historical account — not necessarily wrong, just not enough on its own.

Could Christians or Jews in Europe Have Written It Instead?

If the Muslim-fabrication theory can't carry the whole weight of the explanation, another possibility deserves a look. Could the text have been produced inside Europe, in certain Christian or Jewish circles instead?

It's a serious question. Yet the language of the Gospel of Barnabas, its aims, and the sheer force of its positions make it difficult to treat as an ordinary forgery aimed at winning acceptance within established Christian circles.

A forgery chasing acceptance would normally lean on recognized authorities, existing institutions, or familiar doctrine. It would have reason to move carefully rather than confront the ruling religious structure head-on — to take the path most likely to end in being believed. Barnabas often does the opposite.

Why Is Attacking Paul So Openly Such a Risky Move?

One of the most striking things about the Gospel of Barnabas is how early, and how directly, it turns against Paul. Its opening doesn't hedge. It names Paul, criticizes him outright, and presents him as a man who spread false teaching.

That stance only makes sense once you recognize how much weight Paul actually carries: thirteen New Testament letters bear his name, and he sits close to the center of how later Christian theology developed.[6] Attacking him isn't a minor jab at a side character. It cuts against everything you'd expect from a convenient forgery aimed at broad, safe acceptance in Latin Christian Europe — an unusually costly path to choose.

How Fake “Ancient” Documents Usually Try to Win People Over

Here's a useful comparison. If Barnabas was a forgery built to win authority inside the Christian tradition, why doesn't it behave more like the forgeries and pseudonymous texts (works written under a false or borrowed name) that succeeded at that?

A successful forgery flatters the power it needs. Take two famous medieval cases: the Donation of Constantine (a forged document claiming the Roman emperor Constantine had granted the Pope sweeping political power) and the Pseudo-Isidorian Decretals (a collection of forged papal letters and church-council rulings). Both reached for legitimacy from inside the tradition they were trying to influence.[7] A related pattern shows up, in different forms, in a cluster of early Christian texts that claimed to preserve rules and teachings passed down from the apostles — the Apostolic Constitutions, the Apostolic Canons, the Didascalia Apostolorum, and the Testamentum Domini.[8][9] Yet scholars are confident these were composed later, by unknown authors borrowing apostolic names for credibility.

These texts differ from each other in period, genre, and purpose, and it would be a mistake to lump them all under the single word “forgery” in exactly the same sense. But they lean in a similar direction: they build authority from within the system. They speak under apostolic names. They attach themselves to bishops, councils, liturgy (the formal structure of religious worship), or earlier precedent. They take forms designed to be recognized as legitimate.

Even when these texts turn polemical, they usually shelter that polemic behind borrowed authority. They don't normally open by asking readers inside the established Church to reject a figure as central as Paul, or to abandon the basic structure of the inherited religion.

Measured against works that sought authority within those structures, Barnabas is an unusual fit.[10][11][12][13][33]

Does the Dante Connection Hold Up?

Attempts to link the Gospel of Barnabas directly to Dante do not hold up well under close examination.

The phrase usually raised first is dei falsi e bugiardi — “false and lying gods.” But a single small verbal echo can't carry a strong connection between two texts: the phrase isn't distinctive enough to establish direct dependence, and similar language belongs to a much wider religious vocabulary about false gods and deception.[1]

The comparison doesn't stop there, either. Barnabas and Dante have also been linked through their shared use of the number nine — nine heavens, and, in Dante's case, nine circles of hell. Look closely at those parallels, though, and the resemblance grows much thinner.

In Dante, the nine heavens aren't a loose, symbolic scheme — they're a precise system of distinct celestial spheres. The Moon is one heaven, Mercury another, Venus another, and so on through the Sun, Mars, Jupiter, and Saturn, each its own heaven, with the Fixed Stars and the Primum Mobile (the outermost sphere thought to set all the others in motion) added on top. Dante's structure doesn't even stop at nine — beyond all of them sits the Empyrean, where he places the blessed, the angels, and the presence of God himself.[15]

Barnabas describes something else entirely. Its first heaven is so vast that the whole world looks, by comparison, like a speck of dust; the second heaven surpasses the first the same way; and the scale keeps climbing all the way to the final heaven. Beyond all of them comes Paradise — greater than every heaven put together.[14] But Barnabas never identifies this Paradise with God himself. When the character Peter reaches for that conclusion in the text, Jesus rebukes him directly: Hold thy peace, Peter, for thou unwittingly blasphemest.[14] The overlap between the two texts here is thin; it rests on both using the number nine, not on any shared cosmological system.

The same holds for their versions of hell. Barnabas describes hell through seven regions and seven centres, tied to seven different categories of sin.[16] Dante's Inferno, by contrast, has nine circles.[17] A sevenfold structure does show up in Dante — just not in hell. It's in the Purgatorio, where the mountain's terraces correspond to the seven deadly sins.[18] So even this comparison doesn't line up cleanly: the numbers differ, the structure differs, and the underlying idea differs too.

Strip the Dante comparison down to its actual components, and you're left with one phrase, one shared number, and a loosely similar interest in describing the afterlife. But the cosmologies don't match, hell is built on a different plan, and even the tone differs — Dante's poem is tightly structured and often satirical, while Barnabas reads as sermon-like, heavy, and grave throughout.[16][17][18] That leaves the internal case one serious card to play: the language itself.

The Language Clues: What Do They Show?

A quick definition first: a Gospel harmony, in the sense meant here, blends material from all four canonical Gospels (Matthew, Mark, Luke, and John — the four that made it into the official New Testament) into a single, continuous narrative. Many popular objections to Barnabas are repeated in a fairly loose, polemical way, and are taken up in the homepage sections Sailing Toward Nazareth, Seven and Nine Heavens, The Coming Messiah, and Alleged Contradictions on the Homepage. The actual academic case is narrower than that. It rests mainly on a small cluster of specific observations: the Dante comparison, a question about a “jubilee” reference, some claimed linguistic clues, and — above all — a claim by the scholar Jan Joosten that Barnabas shares a handful of specific readings with Middle Italian Gospel harmonies.[1][4]

The stakes are simple to state. If Barnabas really leans on medieval Italian harmonies, its roots run through medieval Europe. If that link wobbles, the strongest dating tool in the case wobbles with it.

The phrase “academic consensus” needs careful handling here. It can sound like hundreds of independent specialists have studied the Gospel of Barnabas in depth and all landed on the same conclusion. In reality, the specialist literature on this text is fairly small. Most of the scholars who've written about it do date the surviving work late — but they disagree with each other over where it came from, how to study it, who wrote it, and how much weight particular arguments deserve.

A relatively small group of writers, making a few recurring arguments, has shaped most of the discussion — and they aren't all doing the same kind of work.[1][2][36][44] Lonsdale and Laura Ragg translated and edited a manuscript held in Vienna. Sox and Slomp belong to the Morisco-authorship camp. Joosten produced the most detailed studies of the harmony and provenance (origin) question. Schmid and den Hollander critically examined Joosten's method — specifically, the risk of using a possibly late manuscript witness to reconstruct much earlier readings from the Diatessaron. (That's the second-century Gospel harmony compiled by a writer named Tatian; it doesn't survive directly and has to be partly reconstructed from later texts that seem to echo it.) Each conclusion still has to be weighed against the specific evidence and method that particular study offers.

One argument rests on spelling. The printed Italian text of Barnabas contains a handful of unusual spellings — hanno where you'd expect anno, and variant forms of the phrase immenso splendore. These details might contribute something to the history of the surviving manuscript. But they can't, on their own, carry a complete theory of who wrote it, what community produced it, or where it came from.[45]

Spelling variation and scribal correction, after all, are ordinary features of handwritten texts. The Codex Sinaiticus Project (a major digitization effort around one of the oldest and most complete Bible manuscripts in existence) notes that the great majority of its corrections are simply spelling fixes. Five surviving leaves of the Old Testament book of 1 Chronicles, two scribal hands, ninety corrections — that was the scholar Jongkind's count on one small stretch of the manuscript alone.[46][47] None of this makes Barnabas's odd spellings irrelevant — it just draws a necessary line: ordinary spelling variation is one thing, and a consistent set of features that can pin down a region, period, or scribal background is something else.

Joosten's own position, read carefully, is more cautious than the popular shorthand of “Joosten proved it's late.” His aim is not to prove that Barnabas is ancient. His reconstruction points instead toward an Italian, probably late-medieval textual environment, and away from a Spanish or Morisco origin. He treats the Morisco hypothesis as attractive but urges caution about it; he gives priority to the Italian text; and he concludes that although Barnabas certainly became known in a Morisco milieu (setting) at some point, nothing shows that the writing itself began there.[4] On his reading, Barnabas's closest textual contacts make better sense within an Italian Gospel-harmony environment — especially harmonies connected to Venice and Tuscany.[4]

Yet those parallels do not date the whole work. At most, they may connect the surviving Italian text with a broader tradition that preserved readings sometimes described as “Diatessaronic” or Syriac in character. This is exactly where Schmid and den Hollander's warning matters: a possibly late witness cannot be used to reconstruct the second-century Diatessaron directly[36] — a bit like trying to rebuild an original song, note for note, just by studying a modern remix of it. The remix might preserve a few real echoes of the original. It still can't be treated as if it were the original. These parallels may illuminate a history of textual transmission — they do not, by themselves, carry Barnabas back to Tatian's age.

Joosten's five main parallels aren't long shared passages or independent historical proofs — they're small, specific shared readings: two masters who are enemies, in the power of Beelzebul, questions and answers, the enemy of man, and sinned against this one.[4] Each deserves individual examination, but their scale has to stay in view: they do not prove that the entire work, in all its theological and narrative substance, was invented as a late medieval or Morisco forgery.

Several of these examples also weaken under inspection. The two masters who are enemies reading is not an idea imported from nowhere — the canonical saying itself already contrasts loving one master and hating the other. An early Christian sermon called Second Clement, usually placed in the second century, reads the same moral contrast through two opposing realities: this world and the world to come.[37] Likewise, the pull up the weeds wording sometimes mentioned alongside Joosten's examples is not uniquely late Italian — Joosten notes that it also appears in a Persian Gospel harmony and in the Gospel of Thomas.[4][38] These analogues weaken any claim that the readings are unique, although they settle neither the route nor the date by which those readings reached Barnabas.

In their preface, the Raggs say archaism was the explicit goal — they set out to sound old.[39] Even so, modern vocabulary crept in. The unconscious appears twice — chapter 106[40] and, in nearly identical wording, chapter 195[41] — a word first recorded in 1712, its psychological-noun sense only from 1876.[42] Chapter 106 pairs it with the sensitive, vegetative, and intellectual soul, an idea Aristotle already had, in words English didn't yet have.[43] The vocabulary is dated. The ideas aren't.

That pattern runs across more than a dozen other words. Raided (chapter 188) is the youngest — the noun revived by Walter Scott in 1805 and 1818, the verb not coined until 1864, in Civil War English, barely forty years before the Raggs translated. Narrate, used nine times (chapters 43, 115, 136, 167, 185, 186, 188, 208, 221), was still an awkward new word in 1748 — and at chapter 167 it renders Isaiah 53:8 as who shall narrate?, where the King James Bible says who shall declare his generation. The rest: kinship (ch. 133, ~1830), truthfully (ch. 217, early 1800s), repulsive meaning disgusting (ch. 129, ~1810), frenzied (chs. 108, 141, 1796), and outcome (ch. 66, ~1788). Older but still telling: fearsome (ch. 35, ~1768), boyhood and arrangement (chs. 72, 142, 1740s), sane (ch. 64, 1721), amount as a noun (ch. 135, 1710s), and the compounds story-telling (chs. 101, 119) and hailstorm (ch. 53, where the King James Bible just says hail).[55]

That distinction matters more than it looks. Imagine a future reader, cut off from history by some catastrophe, who finds only this translation — no preface, no translator's name. Working from the English alone, they'd reasonably conclude the Gospel of Barnabas was written in the twentieth century. They'd be right about the words and wrong about the text. Any argument for a late date built on vocabulary alone has to rule out the translator first — because a translation always carries its own era's fingerprints, whatever the underlying work's real age.

So here's the honest summary of this whole thread: the language clues are real, specific, and worth taking seriously — but they test a much smaller claim than “the whole Gospel is a late fake.” At most, they suggest Barnabas passed through an Italian Gospel-harmony environment somewhere in its history. They do not settle where the work as a whole began.

Testing the Harmony Theory Properly

A fair comparison should begin by asking what known Gospel harmonies normally do. Tatian's Diatessaron gave a single narrative shape to material from all four Gospels. The early writers Ammonius and Eusebius developed systems for comparing parallel Gospel sections. And early modern harmonies often served as chronological, interpretive, or scholarly arrangements of Gospel material everyone already accepted as canonical.[48][49][50] The relation to the canonical Gospels, the aim of the work, and the function of its narrative sequence all have to be weighed together. The scholar Francis Watson's work on Tatian sharpens the point: even the Diatessaron itself can be discussed as a kind of Gospel-like re-presentation of earlier Gospel material in a new narrative form — meaning “sounds like a harmony” is a spectrum, not a simple yes-or-no switch.[51]

Measured by that test, the harmony case remains suggestive but limited. In places, Barnabas really does stand close to recognizable Gospel material, and those points of contact matter. Yet the work does not simply behave like a neutral rearrangement of the four canonical Gospels — it places familiar material into different scenes and continuations, at times giving it a different theological weight entirely. That prevents a handful of close parallels from posing as a complete explanation all by themselves. One question remains: if the file is this mixed, how did the verdict come to sound so settled?

How a Few Objections Turn Into “Everyone Agrees”

The Verdict Arrives Before the Evidence Does

In much religious apologetics (formal argument in defense of a faith) and polemical writing more broadly, a small handful of claims is repeated until it hardens into an assumed verdict: Barnabas is late, it's inconsistent, it contradicts the Qur'an — therefore, it must be a forgery.

The pattern is easy to spot once you're looking for it. The New Testament book of Acts reports that Barnabas and Paul had a sharp falling-out and went their separate ways,[29] yet Barnabas's harsh criticism of Paul is quickly treated as evidence of forgery. The writer John Gilchrist, for instance, calls it a major tactical blunder.[30] The same reflex fires elsewhere in this debate. If the text differs from the standard Christian account, that's called proof of late forgery. If it resembles known Gospel material, that becomes plagiarism. If it contains any late-looking feature, the whole work is treated as late. If it sounds archaic, it is said to have been made to look old. Catholic Answers' label for it — medieval fake — belongs to the same popular rhythm.[31]

Notice the shape of that reasoning: every possible outcome is counted against the text. That is a test no evidence could ever pass.

Not every objection is empty. But in this pattern, the verdict often arrives before the literary and historical questions have been examined on their own terms.

When a Few Voices Start to Sound Like Everyone

A similar effect appears when a handful of Muslim voices are treated as though they speak for a broad Muslim consensus. Some objections may be adopted in good faith — out of caution, courtesy, or an assumption that the historical matter has already been settled by someone else. But a handful of brief or cautious judgments should not be made to carry the weight of a general verdict.

Watch the chain form: one writer's conjecture becomes the next writer's premise, and a third writer's footnote cites them both. In polemical settings, a narrow point can be lifted from the text, read only on the surface, and passed along as established fact. From there, lines such as even Muslim scholars consider it forged spread easily. Yet some of them prove much weaker when the text itself is checked. One example: the assertion that Barnabas cannot be taken seriously because the Qur'an calls Jesus the Messiah, as if Barnabas rejected that title. The surviving Barnabas text explicitly calls Jesus the Messiah both in its introduction and in chapter 6.[19] The wider question is treated in the homepage section The Coming Messiah.

There is a quieter difficulty here, and it deserves to be stated gently. A Muslim scholar who passes the forgery verdict along on the ground of the text's differences from the Qur'an, after only a surface reading, has, perhaps without noticing, accepted the critics' central thesis: that the book is a Muslim fabrication. Yet that thesis contradicts itself. Such an imagined Muslim forger would not be expected to write nine heavens where the Qur'an speaks of seven (a difference examined in Seven and Nine Heavens), nor to handle the title Messiah the way Barnabas does. If these are to be counted as errors and discrepancies, even the newest and least-schooled Muslim would not have made them. And such a beginner could not have written this text anyway — one that handles deep religious subjects with consistency. A forger is expected to serve his cause; this one, on the critics' own account, damages it twice. Whoever endorses the verdict, then, accepts a paradox along with it: this text runs against the Qur'an — therefore a Muslim must have written it. Here too, the verdict travelled faster than the reading.

Two Ideas That Aren't as Unique as They Seem

A Coming Guide, Foretold in John's Gospel

The line in the Gospel of John about a future guiding figure — usually translated as the “Paraclete” (a Greek term rendered variously as “Advocate,” “Comforter,” or “Helper”) — is not a single, isolated verse: the Paraclete sayings form a substantial cluster of passages across John chapters 14 through 16.

The canonical text associates the Paraclete closely with the Holy Spirit. Whether that language may also carry a broader expectation of guidance still to come remains an open question — one examined in detail in the supporting pages The Paraclete and the Three Barriers and Biblical Passages and the Coming Messenger.[21] In Barnabas, meanwhile, a related expectation of a coming prophet appears across nine contexts in eleven chapters.[23] This does not make Barnabas identical with the canonical Gospels. It does make the distance between the two less simple than it is often presented.

The same question can be approached from another direction. Matthew preserves a strong prophetic and monotheistic (focused on the oneness of God) line of its own. Jesus says he has come not to abolish the Law and the Prophets but to fulfil them. He names love of God with all one's heart as the greatest commandment. And in prayer he submits his own will to God's will.[20] Barnabas is distinctive less for inventing this line than for making it more open and structural. It is also possible that, in some of the places where the name Muhammad appears explicitly, the choice goes back to a later editor or translator. In those places the earliest text may simply have said the prophet who is to come. In some of them the word may even have been Periklytos — a Greek term meaning praised, matching in that sense the name Ahmad and built on the same consonants as the Paraclete discussed above — or a corresponding word in an Aramaic original. A later editor or a translator, taking these expressions to refer to Prophet Muhammad, may have written them out directly as his name. Such a choice would not be surprising: as the vocabulary evidence above showed, a translation carries its own era's fingerprints, and this translation was made centuries after the apostles, by people who already knew Islam and its Prophet. That remains a historical hypothesis considered here, not an established result of textual criticism.

The Crucifixion Difference, in Early Christian Context

Barnabas parts company with the later, mainstream Christian account of the crucifixion, but alternative understandings of the Passion (the Christian narrative of Jesus's arrest, trial, and death) were not unique to it. According to the early Christian writer Irenaeus, the followers of a second-century teacher named Basilides taught that Simon of Cyrene was crucified in Jesus's place. Later heresy-cataloguing writers (heresiological sources — Christian authors whose specific purpose was to identify and refute beliefs the Church considered false) turn up a second case. They describe Cerinthus, a Jewish-Christian teacher active around the turn of the second century, as teaching that the heavenly Christ departed from Jesus before the Passion. Docetic circles — communities holding a belief called Docetism, that Christ's sufferings were only apparent rather than fully physical — were already drawing written attacks from the early Christian bishop Ignatius of Antioch in the early second century.[24]

These reports come down to us largely through writers who opposed the groups they described and must be handled with that bias in mind. None of them proves Barnabas's own account. They show only that the crucifixion difference cannot be dismissed as though no comparable question had ever arisen within the diversity of early Christianity.

One small detail is rarely discussed in this context. In the canonical Gospels, the crucified figure cries, “My God, my God, why have you forsaken me?” (Mark 15:34; Matthew 27:46). Within later Trinitarian theology, these words have traditionally been understood through Psalm 22 and the mystery of Christ's suffering. Yet if the Barnabas account is considered even as a historical hypothesis, the same cry takes on a different character. A man suddenly mistaken for Jesus, unable to convince anyone of his true identity, left to an unexpected execution, would naturally express bewilderment and a sense of abandonment. On that reading, the emotional force of the saying fits more naturally within the Barnabas account than within the theological explanations that later developed around the canonical crucifixion narrative.

Where Does All This Leave Us?

The late-fabrication theory can account for some real features of the surviving text: its late manuscript form, its later language, and some of its visible layers of later editing. None of that should be denied.

The harder question is whether a simple forgery theory can carry the rest at once. It has to cover the older notices of a Gospel under Barnabas's name, the tomb tradition, and the Roman and Vatican trail. It also has to cover the unusual theological profile of the work, its distance from later Nicene Christian development (the doctrine formally settled at the Council of Nicaea in 325 CE), and its reappearance in a later European manuscript form.

If the dismissal turns out to be weaker than it first looks, the next step is not to declare the text untouched or original. It is to ask what kind of historical path could hold both sides of the evidence together: the late form we actually possess, and the older traces that a simple late-invention theory leaves unresolved.

Hold the two ends of the evidence side by side one last time: an Italian manuscript you can touch, late and layered — and behind it, a title that keeps surfacing in catalogues compiled a thousand years earlier.

Real history rarely hands you a clean verdict. More often, it hands you a better question.

Next Step Follow the historical model → Pressed hard, the forgery explanation still leaves part of the evidence standing. So the question now turns constructive and historical: what path could hold all of that evidence together without forcing it into a simple late-invention theory? The next page works by process of elimination toward a model that explains both the late form and the older pattern — not as proof, but as the reading that strains the evidence least.

References

[1] Jan Joosten, The Date and Provenance of the Gospel of Barnabas, Journal of Theological Studies 61/1 (2010), pp. 200–215.

[2] Jan Slomp, The Gospel of Barnabas, in Christian-Muslim Relations 1500–1900; see especially his summary of Morisco-origin arguments and discussion of the Spanish manuscript, Morisco setting, and related provenance claims.

[3] Decretum Gelasianum (the Gospel in the name of Barnabas apocryphum).

[4] Jan Joosten, The Gospel of Barnabas and the Diatessaron, Harvard Theological Review 95/1 (2002), pp. 73–96. See pp. 74–75 on caution toward the Morisco hypothesis and Italian priority; pp. 87–88 on the five Barnabas–Italian harmony readings; pp. 90–92 on western/eastern Diatessaronic and Old Syriac links; and pp. 95–96 on the conclusion that Barnabas used a Middle Italian harmony while also becoming a witness, in some readings, to the Old Latin harmony or original Diatessaron.

[5] Leviticus 25:11; Gospel of Barnabas, chapter 82, in Ragg, The Gospel of Barnabas (1907), on the jubilee wording.

[6] Encyclopaedia Britannica, Pauline letters and related entries on Paul.

[7] Encyclopaedia Britannica, Donation of Constantine; sources on the False Decretals / Pseudo-Isidorian forgeries.

[8] Apostolic Constitutions, Apostolic Canons, and Didascalia Apostolorum.

[9] Testamentum Domini.

[10] Pseudo-Dionysian corpus.

[11] Clementine Homilies, Clementine Recognitions, and Second Letter of Clement.

[12] The supposed correspondence between Paul and Seneca.

[13] The Symmachian Forgeries and Benedict Levita.

[14] Gospel of Barnabas, chapter 178, in Ragg, The Gospel of Barnabas (1907), on the ascending heavens and Paradise beyond them.

[15] Dante Alighieri, Paradiso, cantos II–XXVIII and XXX–XXXIII; Robert and Jean Hollander, trans., Paradiso (New York: Doubleday, 2007), on the nine celestial spheres and the Empyrean beyond them.

[16] The Gospel of Barnabas, chapters 59 and 135.

[17] Dante Alighieri, Inferno, especially cantos V–XXXIV; Robert and Jean Hollander, trans., Inferno (New York: Doubleday, 2000), on the ordered circles of hell.

[18] Dante Alighieri, Purgatorio, cantos X–XXVII; Robert and Jean Hollander, trans., Purgatorio (New York: Doubleday, 2003), on the seven terraces associated with the seven capital sins.

[19] Gospel of Barnabas, prologue and chapter 6.

[20] Matthew 5:17–19; 10:40–41; 13:57; 15:24; 21:11; 22:37–40; 26:39–42.

[21] John 14:16; 15:26; 16:7–14.

[22] Luis F. Bernabé Pons, El texto morisco del Evangelio de San Bernabé (Granada–Alicante, 1998), the modern edition and study of the surviving Spanish witness.

[23] North American Society for the Study of Christian Apocryphal Literature (NASSCAL), e-Clavis: Christian Apocrypha, entry on the Gospel of Barnabas. The entry notes explicit future-prophet references in chapters 17, 44, 55–56, 82–83, 97, 136–137, 163, 212, and 220 — nine contexts across eleven chapters.

[24] On these early heterodox lines, see Encyclopaedia Britannica, Basilides, Cerinthus, and Docetism; and Irenaeus, Against Heresies I.24 on the Basilidian claim that Simon of Cyrene was crucified in Christ's stead.

[25] Heather J. Sharkey, A History of Muslims, Christians, and Jews in the Middle East, esp. chs. 1–2 on shared worlds, daily life, and intercommunal relations.

[26] Alexander Treiger, ʾInǧīl-in mubīn: A Mixed Archaic, Qur’anic, and Middle Arabic Translation of the Gospels and Its Implications for the Nature of Middle Arabic, Bulletin of the School of Oriental and African Studies.

[27] Selim Deringil, Conversion and Apostasy in the Late Ottoman Empire; see also his There Is No Compulsion in Religion on conversion in the late Ottoman world.

[28] Among countless historical examples, five may be noted here: William Tyndale's New Testament, blocked by English authorities and smuggled into England; Protestant books carried from Geneva into France through underground networks during the Reformation; Boris Pasternak's Doctor Zhivago, published abroad after being blocked in the Soviet Union; Aleksandr Solzhenitsyn's The Gulag Archipelago, first published in Paris after Soviet suppression; and the wider samizdat / tamizdat phenomenon, in which censored works were secretly copied or smuggled abroad for publication.

[29] Acts 15:36–41, especially verse 39, on the sharp disagreement between Barnabas and Paul.

[30] John Gilchrist, Origins and Sources of the Gospel of Barnabas, where the anti-Pauline opening is described as a major tactical blunder.

[31] Catholic Answers, Why the 'Gospel of Barnabas' Is a Medieval Fake.

[32] J. E. Fletcher, The Spanish Gospel of Barnabas, Novum Testamentum 18/4 (1976), on the rediscovered Spanish witness and its manuscript history.

[33] Bart D. Ehrman, Forgery and Counterforgery: The Use of Literary Deceit in Early Christian Polemics (New York: Oxford University Press, 2013), for a broad study of pseudonymous and forged writings in early Christian controversy.

[34] L. P. Harvey, Muslims in Spain, 1500 to 1614 (Chicago: University of Chicago Press, 2005), on Morisco history, language, and religious life.

[35] Vincent Barletta, Covert Gestures: Crypto-Islamic Literature as Cultural Practice in Early Modern Spain (Minneapolis: University of Minnesota Press, 2005), on Spanish and aljamiado Morisco literary culture.

[36] August den Hollander and Ulrich Schmid, The Gospel of Barnabas, the Diatessaron, and Method, Vigiliae Christianae 61/1 (2007), pp. 1–20. The abstract states that Joosten introduced the Gospel of Barnabas, perhaps as late as the sixteenth or seventeenth century, as a potential source for readings of Tatian's second-century Diatessaron, and that the article offers a methodological critique of Joosten's analysis.

[37] Second Clement, especially chapter 6, on the opposition between this world and the world to come; see also Early Christian Writings, Second Clement, on its usual second-century placement.

[38] Gospel of Thomas, saying 57, on the weeds being pulled up; see also Early Christian Writings, Gospel of Thomas, on Thomas as an early apocryphal gospel usually discussed in relation to the second century.

[39] Lonsdale and Laura Ragg, The Gospel of Barnabas (Oxford: Clarendon Press, 1907), Preface. The translators state that they tried to preserve the archaic form and something even of the crudeness of the original.

[40] Ragg, The Gospel of Barnabas (1907), chapter 106, The Soul and the Sense. The passage contains both the sensitive, vegetative, and intellectual soul and as is seen in the unconscious when the sense leaveth him.

[41] Ragg, The Gospel of Barnabas (1907), chapter 195, Death, the Soul, and the Present Life. The passage says that the unconscious waiteth for the sense to return.

[42] Douglas Harper, unconscious, Online Etymology Dictionary. The entry distinguishes older adjectival uses from the noun the unconscious in psychology, recorded from 1876 as a loan-translation of German das Unbewusste.

[43] On the philosophical background of soul-faculty language, see Encyclopaedia Britannica, Aristotle — Philosophy of mind, on vegetative and sensitive soul; and Stanford Encyclopedia of Philosophy, Aristotle's Psychology, on nutritive, perceptual, and intellectual faculties.

[44] David Sox, The Gospel of Barnabas (London: George Allen & Unwin, 1984); see also Slomp, ref. 2 above, for the Morisco-authorship line and related provenance arguments.

[45] Ragg and Ragg, The Gospel of Barnabas (1907), Italian text, chs. 3–4, pp. 8 and 15, where the printed text gives forms such as imenso splendore and inmensso/inmenso splendore; and ch. 149, p. 344, where ogni hanno appears where ogni anno would be expected.

[46] Codex Sinaiticus Project, The Transcription, explaining correction types in Sinaiticus and noting that the great majority of its corrections are spelling changes.

[47] Dirk Jongkind, Studies in the Scribal Habits of Codex Sinaiticus, Tyndale Bulletin 56/2 (2005), pp. 154–57, especially p. 156: on five extant leaves of 1 Chronicles, two scribes made ninety corrections in total.

[48] Encyclopaedia Britannica, Diatessaron, describing Tatian's work as the four New Testament Gospels compiled as a single narrative, probably around AD 150, and noting its use in the Syriac East until about AD 400.

[49] Matthew R. Crawford, Ammonius of Alexandria, Eusebius of Caesarea and the Origins of Gospels Scholarship, New Testament Studies 61/1 (2015), pp. 1–29, on Ammonius, Eusebius, and comparative Gospel scholarship.

[50] Kirsten Macfarlane, Gospel Harmonies and the Genres of Biblical Scholarship in Early Modern Europe, Renaissance Quarterly 76/4 (2023), pp. 1189–1227, reassessing Gospel harmonies as serious early modern scholarly and interpretive works.

[51] Francis Watson, Harmony or Gospel? On the Genre of the (So-called) Diatessaron, in Matthew R. Crawford and Nicholas J. Zola, eds., The Gospel of Tatian: Exploring the Nature and Text of the Diatessaron (London: Bloomsbury T&T Clark, 2019), pp. 69–92; see also Watson, Towards a Redaction-Critical Reading of the Diatessaron Gospel, Early Christianity 7/1 (2016), pp. 95–112.

[52] Fariba Zarinebaf, Intercommunal Life in Istanbul During the Eighteenth Century, Review of Middle East Studies 46/1 (2012), pp. 79–85, especially on mixed residential quarters and porous social interaction among Muslim and non-Muslim communities in Ottoman Istanbul.

[53] Mark Mazower, Salonica, City of Ghosts: Christians, Muslims and Jews, 1430–1950 (New York: Knopf, 2004); Nora Lafi, The Municipality of Salonica between Old Regime, the Ottoman Reforms and the Transition from Empire to Nation State, on Salonica as a city with a plural population; and Rossitsa Gradeva, Jews and Ottoman Authority in the Balkans: The Cases of Sofia, Vidin and Ruscuk, 15th–17th Centuries, in Rumeli Under the Ottomans, 15th–18th Centuries (Istanbul: Isis Press, 2004), pp. 225–85.

[54] Heather J. Sharkey, A History of Muslims, Christians, and Jews in the Middle East (Cambridge University Press, 2017), on shared Ottoman worlds and intercommunal life; Bruce Masters, Christians and Jews in the Ottoman Arab World (Cambridge University Press, 2001), on the Arab provinces; Cathie Carmichael, A Concise History of Bosnia (Cambridge University Press, 2015), esp. ch. 2; Edin Hajdarpašić, Frontier Anxieties: Toward a Social History of Muslim-Christian Relations on the Ottoman-Habsburg Border, Austrian History Yearbook 51 (2020); and Michał Hartmuth, Mosque-Building on the Ottoman-Venetian Frontier, on major Muslim urban communities including Mostar. The map itself is Chamboz, Ottoman Empire and Its Dependencies in 1683, Wikimedia Commons, CC BY-SA 4.0.

[55] Douglas Harper, raid, Online Etymology Dictionary, on the noun's revival by Walter Scott (1805, 1818) and the verb "raided" from 1864, in American Civil War usage; see also the dictionary's entries for narrate (1748), kinship (c. 1830), truthful/truthfully, repulsive (in the sense "disgusting," from c. 1810), frenzied (1796), outcome (1788), fearsome (1768), boyhood (1745), arrangement (1740s), sane (1721, a back-formation from insane), amount as a noun (1710s), story-telling, and hailstorm.