He knows that which goes down into the earth and that which comes out of it, and that which comes down from the heaven and that which goes up to it; and He is the Merciful, the Forgiving.

And were it not that all people had been a single nation, We would certainly have assigned to those who disbelieve in the Beneficent Allah (to make) of silver the roofs of their houses and the stairs by which they ascend.