Surah Al-Hijr 15:21

وَإِن مِّن شَىْءٍ إِلَّا عِندَنَا خَزَآئِنُهُۥ وَمَا نُنَزِّلُهُۥٓ إِلَّا بِقَدَرٍ مَّعْلُومٍ

And there is not a thing but that with Us are its depositories, and We do not send it down except according to a known [i.e., specified] measure.

Translation: Saheeh International

Tafsir

And there is not a thing but that the stores thereof the keys to its stores are with Us and We do not send it down except in a known measure according to the benefits of all creatures.

Excerpt from Tafsir al-Jalalayn, commentary on 15:21, via Quran.com. The reader has the full commentary and 9 more tafsirs.