He sends down some water from the clouds so that the water courses flow up to their capacity, and the torrent carries (on its surface) swelling foam. And out of that (metal) which the people heat in the fire seeking to make ornaments and other articles a similar foam rises to (the surface of) it. In this way does Allâh illustrate truth and falsehood. As for the foam it goes away as (does all) dross, but as to that which does good to mankind it stays in the earth. That is how Allâh sets forth excellent description of things.