The Prophet (ﷺ) was unable to read or write. Everything the companions recorded was through the Prophet (ﷺ). How do we know what the Prophet had given to be passed down is accurate despite his illiteracy?
Allah SWT promised and guaranteed that he would protect the Qur'an. Secondly, the main dominant method of preservation of the Qur'an was initially done orally and passed down from generation to generation.
Shaykh Mohammed Mana explains and answers
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