"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]

"So when you want to recite the Quran, seek refuge with Allah from Shaytaan, the outcast (the cursed one)."
[Al-Nahl 16:98]

"And (it is) a Quran which We have divided (into parts), in order that you might recite it to men at intervals. And We have revealed it by stages."
[Al-Israa 17:106]

"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]

"Verily, We have sent down to you (O Muhammad) the Book (this Quran) for mankind in truth. So whosoever accepts the guidance, it is only for his ownself; and whosoever goes astray, he goes astray only for his (own) loss. And you (O Muhammad) are not a Wakeel (trustee or disposer of affairs, or guardian) over them"
[Al-Zumar 39:4]