The Cave - 18:50
"When We said to the angels, "Prostrate yourselves to Adam", they all prostrated, except Iblis. He became one of the jinn because he disobeyed the command of his Lord. Do you take him and his progeny as your friends besides Me, while they are your enemies? What an evil change is this for the wrongdoers."
The evil consequence of this change for the wrongdoers who leave Allah and take Satan as their friend:
Yaseen/36:60
O children of Adam, did I not take a promise from you that you would not serve Satan? He is your open enemy.
Yaseen/36:61
Serve Me. This is the most right way.
Yaseen/36:62
Yet he has led astray many generations from you. Would you never use your reason?
Yaseen/36:63
This is Hell, which is promised to you!
Yaseen/36:64
Burn therein as a consequence of your disbelief.