It is narrated that when the following verse was revealed:

Wal lazeena iza fa alu faheshat au zalamu anfusahu zakaru wa allaha fasthagfir wal zunubehim ….

Allah forgives those who repent after committing sins.

Satan cried out and his retainer assembled around him and asked, " What has happened? Why are you shouting?" The accursed one said, " Why shouldn't I shout and cry! We work so hard to make a man commit sins. And he expresses penitence that renders our efforts null and void!"

Every individual from his retainers gave his own advice on the matter. But Satan was not satisfied with any of those. Then someone said, " The only way will be to prevent man from reaching the threshold of the door of penitence!" Satan said, " Your suggestion is right! If there is any way for us, this is the way!"