Quran 38.73-76
The angels fell down prostrate, every one, Saving Iblis; he was scornful and became one of the disbelievers. He said: O Iblis! What hindereth thee from falling prostrate before that which I have created with both My hands? Art thou too proud or art thou of the high exalted? He said: I am better than him. Thou createdst me of fire, whilst him Thou didst create of clay.