After Qur’an, the second source of doctrine and legislation in Islam is the Ahadith (utterances) of the Holy Prophet (S) himself. A very large number of collections of the Prophet’s words thus appear under the title of Ahadith, and thousands of Ahadith and traditions attributed to the Holy Prophet are recorded in the Ahadith books.
The amazing remarkable point here is the fact that all these utterances of the Prophet (Ahadith) which were also in pure Arabic language like that of Qur’an, and the Prophet whose tongue would recite the Arabic Qur’an, bore no resemblance whatsoever to the Qur’an. What must be heavily stressed over here is the disparity between these two groups of texts - Qur’an and Ahadith - from a literary and stylistic point of view. It would be unthinkable to compare the style of Qur’an with that of the Ahadith. This itself is a convincing proof that the Qur’an originated from a source other than the mind of the Prophet.