"Then High above all be Allah, the True King. And be not in haste (O Muhammad) with the Quran before its revelation is completed to you, and say: "My Lord! Increase me in knowledge."
[Ta-Ha 20:114]

"Verily, this Quran guides to that which is most just . . ."
[Al-Israa 17:9]

"Verily, We, it is We Who have sent down the Dhikr (i.e. the Quran) and surely, We will guard it (from corruption)"
[Al-Hijr 15:9]

"And We have sent down to you the Book (the Quran) as an exposition of everything, a guidance, a mercy, and glad tidings for those who have submitted themselves (to Allah as Muslims)"
[Al-Nahl 16:89]

"Ta-Seen [These letters are one of the miracles of the Quran, and none but Allah (Alone) knows their meanings]. These are the Verses of the Quran, and (it is) a Book (that makes things) clear"
[Al-Naml 27:1]