The Islamic prophet Muhammad lived in the 6th Century CE, in Arabia in a time when few people were literate. The Arabs preserved their histories, genealogies, and poetry by memory alone. According to tradition, when Muhammad proclaimed the verses later collected as the Qur'an, his followers preserved the words by memorizing them, then approximately eight months after the death of the Prophet, when the entire Quran was written down by his companions (sahaba), anywhere from 10,000 to 150,000 had it memorized perfectly at the time of its inscription, ensuring the authenticity of al-Qur'an.

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