And they follow what devilish beings used to chant against the authority of Solomon, though Solomon never disbelieved and only the devils denied, who taught sorcery to men, which, they said, had been revealed to the angels of Babylon, Harut and Marut, who, however, never taught it without saying: “We have been sent to deceive you, so do not renounce (your faith).” They learnt what led to discord between husband and wife. Yet they could not harm any one or without the dispensation of God. And they learnt what harmed them and brought no gain. They knew indeed whoever bought this had no place in the world to come, and that surely they had sold themselves for something that was vile. If only they had sense!
— Quran 2:103