revealed in stages

وَبِٱلْحَقِّ أَنزَلْنَـٰهُ وَبِٱلْحَقِّ نَزَلَ ۗ وَمَآ أَرْسَلْنَـٰكَ إِلَّا مُبَشِّرًا وَنَذِيرًا

We sent down the Quran with the truth, and with the truth it has come down- [Prophet], We sent you only to give good news and warning-

وَقُرْءَانًا فَرَقْنَـٰهُ لِتَقْرَأَهُۥ عَلَى ٱلنَّاسِ عَلَىٰ مُكْثٍ وَنَزَّلْنَـٰهُ تَنزِيلًا

it is a recitation that We have revealed in parts, so that you can recite it to people at intervals; We have sent it down little by little.