Refusing to bow to Adam
Allah said, “O Iblees, what has kept you from joining those who prostrate?”
7:12He said: What hindered thee that thou didst not fall prostrate when I bade thee? (Iblis) said: I am better than him. Thou createdst me of fire while him Thou didst create of mud.
15:32He said: O Iblis! What aileth thee that thou art not among the prostrate?
17:61And when We said unto the angels: Fall down prostrate before Adam and they fell prostrate all save Iblis, he said: Shall I fall prostrate before that which Thou hast created of clay?