وَقُرْآنًا فَرَقْنَاهُ لِتَقْرَأَهُ عَلَى النَّاسِ عَلَىٰ مُكْثٍ وَنَزَّلْنَاهُ تَنزِيلًا (106)
(17:106) And we have sent down this Qur'an piecemeal so that you may recite it to the people gradually piece by piece, and We have sent it down by gradual Revelations *119 (to suit particular occasions).
*119) This is an answer to this objection: "Why has not Allah sent down His Message as a whole? Why is He sending it piecemeal? Has Allah any need to think deliberately what to send down?" As the answer to this objection has been given in XVI: 101-102 and in the Explanatory Notes 104-106 added to them, there is no need to repeat the same here.