Did you not consider that (it is) Allah (Who) causes the driving of the clouds then the unification between them, then He makes them a heap, so you see the rain coming out of the spaces in between them, and He causes (the rain) to be sent down from the sky, from the mountainous volumes therein of coolness {2}, then He causes it to fall on whom He wills and turns it away from whom He wills, the flash of His lightning almost takes away the sights.