﴿ وَمَا نَتَنَزَّلُ إِلَّا بِأَمْرِ رَبِّكَ ۖ لَهُۥ مَا بَيْنَ أَيْدِينَا وَمَا خَلْفَنَا وَمَا بَيْنَ ذَٰلِكَ ۚ وَمَا كَانَ رَبُّكَ نَسِيًّۭا ﴾

“AND [the angels say]: "We do not descend [with revelation], again and again, other than by thy Sustainer's command: unto Him belongs all that lies open before us and all that is hidden-from us and all that is in-between. And never does thy Sustainer forget [anything] –”

Please check ayah 19:65 for complete tafsir.