وَإِن مِن شَيءٍ إِلّا عِندَنا خَزائِنُهُ وَما نُنَزِّلُهُ إِلّا بِقَدَرٍ مَعلومٍ

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 measure.