[Do you not see that Allah drives along] meaning: He initiates [clouds, then He brings them together] meaning: He gathers one part to another, [then He makes them into a heap] one upon another, [and you see the rain] meaning: the rain [emerging from within them] from within the clouds, [and He sends down from the sky, from mountains within it, of hail] He sends down from those mountains which are of hail, [striking with it whom He wills] destroying the crops, [and averting it from whom He wills]. He averts that hail, [the flash of its lightning almost] meaning: the light of its lightning.

Surah An-Nur (from verse 44 to verse 53).