Fragments of a 1,370-year-old copy of the Koran, one of the oldest in existence, have been discovered in the University of Birmingham's library.
Experts have said it is possible that its writer might even have known Prophet Muhammad.
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"They could well take us back to within a few years of the actual founding of Islam," said David Thomas, the university's professor of Christianity and Islam.
Muslim tradition says Prophet Muhammad received the revelations that form the Koran, the scripture of Islam, between the years 610 and 632, the year of his death, Thomas told the BBC. Passages were written on parchment, stone, palm leaves and the shoulder blades of camels, with a final book completed in about 650.
"The person who actually wrote it could well have known the Prophet Muhammad. He would have seen him probably, he would maybe have heard him preach. He may have known him personally – and that really is quite a thought to conjure with," he said.
Dr Muhammad Isa Waley, curator for such manuscripts at the British Library, told the BBC the "exciting discovery" would make Muslims "rejoice".
He believes the texts, written in "surprisingly clear" script, "almost certainly date from the time of the first three caliphs", the first leaders in the Muslim community between 632 and 656.