Children of Adam! We have sent down to you the dress that covers your shame and provides adornment. As for the Dress of Taqwa, that is the best. That is one of the signs of Allah, so that they may learn a lesson. Children of Adam! Do not let Shaytan tempt you into trouble as he expelled your parents from the Garden, stripping them of their covering and disclosing to them their private parts. He and his tribe see you from where you do not see them. We have made the shaytans friends of those who have no iman (Quran 7:26-27)

He sends down water from the sky and river-beds fill up and flow according to their size, and the floodwater carries with it an increasing layer of scum; a similar kind of scum comes from what you heat up in the fire, when you desire to make jewellery or other things. That is how Allah depicts the Truth and the Falsehood. As for the scum, it is quickly swept away. But as for that which is of use to people, it remains behind in the ground. That is a metaphor which Allah has made (Quran 13:17)