The Literary Fingerprint: Who Authored the Quran? | Facts about the Muslims & the Religion of Islam

For centuries, a central question has intrigued scholars and skeptics alike: Who wrote the Quran? To many Muslims, the answer is a matter of divine revelation; the text is the literal word of God, transmitted through the Prophet Muhammad, peace be upon him. To others, particularly a non-Muslim audience, a more natural explanation might be that the Prophet Muhammad, peace be upon him, was the author. But what if we could apply a modern, objective test to this ancient text? What if we could analyze its literary DNA?

This is precisely what the field of stylometry offers. Stylometry is the statistical analysis of writing style, a kind of literary fingerprinting. Just as every individual has a unique way of constructing sentences, choosing words, and employing grammar, every author leaves a distinct stylistic signature in their text. This method has been used to settle debates about Shakespeare’s plays, uncover anonymous authors, and analyze religious texts like the Bible, where scholars have long questioned the authorship of certain books based on stylistic evidence.

When this same scientific lens is focused on the Quran, the results are striking. They present a powerful, data-driven argument that the Quran could not have been written by the man who conveyed it.

Comparing the words in the Quran vs. the words of the Prophet

To test the authorship of the Quran, scholars needed a reliable benchmark, a known sample of the Prophet Muhammad’s, peace be upon him, own words. Muslims believe they have exactly that in the Hadith. The Hadith are vast collections of reports detailing the Prophet’s sayings, actions, and approvals on every aspect of life, from spiritual guidance to everyday manners. Unlike the Quran, which Muslims hold as the direct speech of God, the Hadith are understood to be the Prophet’s own human speech.

The most revered collection is Sahih al-Bukhari, compiled the sayings of the Prophet, peace be upon him, passing through a rigorous process of verification. For fluent Arabic speakers, the difference between the Quran and the Hadith has always been apparent. The Quran’s language is described as uniquely rhythmic, profound, and inimitable, while the Hadith, though wise and authoritative, are clearly in the style of human narrative and instruction.

But is this perceived difference merely subjective, or can it be proven? A statistical stylometric study conducted by researcher Halim Sayoud, entitled “Author Discrimination between the Holy Quran and Prophet’s Statements,” set out to answer this question with hard data.

The Numbers Don’t Lie: A Statistical Comparison

Published in the academic journal Literary and Linguistic Computing, Sayoud’s study conducted a series of sixteen different computational experiments, comparing the text of the Quran with the text of Sahih al-Bukhari. The conclusions were unanimous and clear: the two texts must have two completely different authors.

One of the most straightforward findings was the vast difference in vocabulary. The analysis revealed that a staggering 62% of the words found in the Hadith of Bukhari do not appear in the Quran at all. Conversely, 83% of the words in the Quran are not found in the Bukhari Hadith. These are known as “discriminant words”, terms unique to one text and absent from the other. This is a massive stylistic divergence. If the same author wrote both, we would expect a significant overlap in vocabulary, reflecting his personal lexicon. Instead, we find two distinct linguistic worlds.¹

The differences went far beyond simple word lists. The study analyzed the frequency of word lengths (how often single-letter words, three-letter words, etc., are used), and found significant disparities. It examined the use of singular and plural forms, discovering another layer of stylistic separation. Most compellingly, it ran the texts through a series of sophisticated stylometric classifiers, tools with names like Canberra distance, cosine distance, and Naïve Bayes classifier. These algorithms are designed to detect the subtle, unconscious patterns that define an author’s style. In every single test, the result was the same: the stylistic profiles of the Quran and the Hadith were statistically irreconcilable. The data firmly rejected the hypothesis of a single author.

The Humanly Impossible Feat

The statistical evidence is compelling on its own, but it becomes even more powerful when considered in its historical context. The Quran was not revealed as a single, pre-written book. According to Islamic tradition, it was communicated to the Prophet Muhammad, peace be upon him, piecemeal over 23 years, in response to specific and often unplanned events.

A verse might be revealed instantly after a sudden battle, in answer to a challenging question from a skeptic, or to provide guidance during a moment of community crisis. There was no time for careful drafting, editing, or stylistic planning. The Prophet Muhammad, peace be upon him, who was known by his peers as trustworthy but uneducated in the formal poetry and rhetoric highly prized in his society, would have had to spontaneously produce passages of the Quran that maintained this incredibly distinct and consistent stylistic fingerprint, a fingerprint completely different from his own everyday speech recorded in the Hadith.

Imagine a political leader giving impromptu press conferences for 23 years. Their answers would vary in tone, vocabulary, and sentence structure based on their mood, the topic, and the circumstances. Now imagine if every single one of those answers, across two decades, could be statistically proven to have been written in the exact same unique style—a style that was entirely different from the same leader’s meticulously prepared speeches and private conversations. The notion stretches credulity.

This is the point powerfully made by scholars like Dr. Muhammad Draz, who compared the Quranic style to planets speeding through their orbits, while all human styles, no matter how eloquent, are like cars moving on the surface of the Earth. They operate on fundamentally different planes.

 A Rational Basis for a Faith Conclusion

For a general audience, this stylometric analysis offers a rational, evidence-based perspective on a profound theological question. It doesn’t attempt to prove the divine origin of the Quran, that remains a matter of faith. What it does provide is a strong empirical basis for eliminating the most common naturalistic explanation: that the Prophet Muhammad, peace be upon him, authored the Quran.

The data from Halim Sayoud’s study suggests that the voice of the Quran and the voice of the Prophet Muhammad, peace be upon him, as preserved in the Hadith, are literarily incompatible. They represent two distinct sources. For those who believe, this analysis resonates with the Islamic teaching of the Quran as a miraculous and inimitable revelation. For the neutral observer, it presents a fascinating historical and literary puzzle that challenges simplistic assumptions about the origins of one of the world’s most influential books. The literary fingerprint of the Quran, it seems, points beyond its messenger.

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