Qur'an, Yunus, Surah 10:37-38
This Qur'an is not such as can be produced by other than Allah. On the contrary it is a confirmation of (revelations) that went before it, and a fuller explanation of the Book--wherein there is no doubt--from the Lord of the worlds.
Or do they say, "He forged it"? Say: "Bring then a Sura like unto it, and call (to your aid) anyone you can besides Allah, if it be ye speak the truth!"