﴿وَإِنْ مِنْ شَيْءٍ إِلَّا عِنْدَنَا خَزَائِنُهُ وَمَا نُنَزِّلُهُ إِلَّا بِقَدَرٍ مَعْلُومٍ﴾ (21) 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.
