Surah Al-Hijr (The Stone Valley), Verse 21

وَاِنْ مِّنْ شَیْءٍ اِلَّا عِنْدَنَا خَزَآىِٕنُهٗ وَمَا نُنَزِّلُهٗۤ اِلَّا بِقَدَرٍ مَّعْلُوْمٍ ۟

Wa im min shai'in illaa 'indanaa khazaaa 'inuhoo wa maa nunazziluhooo illaa biqadarim ma'loom

“And there is not a thing but its (sources and) treasures (inexhaustible) are with Us; but We only send down thereof in due and ascertainable measures.”

Quran 15:21 (Yusuf Ali Translation)