"He (Allah) it is Who has sent unto you the Book (i.e. this Qur'an), explained in detail. They know full well, to whom We have given the Book, that it has been sent down from your Lord in truth. Never be then of those who doubt.” [Qur'an 6:114]

“For We had certainly sent unto them a Book based on knowledge, which We explained in detail a guide and a mercy to all who believe.” [Qur'an 7:52]