17:106
وَقُرْآناً فَرَقْنَاهُ لِتَقْرَأَهُ عَلَى النَّاسِ عَلَى مُكْثٍ وَنَزَّلْنَاهُ تَنزِيلاً
(It is) a Qur'an which We have divided (into parts from time to time), in order that thou mightest recite it to men at intervals: We have revealed it by stages.
76:23
إِنَّا نَحْنُ نَزَّلْنَا عَلَيْكَ الْقُرْآنَ تَنزِيلاً
It is We Who have sent down the Qur'an to thee by stages.