(Thwaha) 20 : 116
وَإِذْ قُلْنَا لِلْمَلَائِكَةِ اسْجُدُوا لِآدَمَ فَسَجَدُوا إِلَّا إِبْلِيسَ أَبَىٰ
And when We said to the Angels: "Prostrate to Adam," and they all prostrated except Iblees, he refused.
See explanation 7: 11-13.