Authored by Allah

Do they not reflect on the Quran? If it were from anyone other than Allah, they would have found many contradictions in it.

4:82Will they not then ponder on the Qur'an? If it had been from other than Allah they would have found therein much incongruity.

10:37And this Qur'an is not such as could ever be invented in despite of Allah; but it is a confirmation of that which was before it and an exposition of that which is decreed for mankind - Therein is no doubt - from the Lord of the Worlds.