[ Allah ] said, “What prevented you from prostrating when I commanded you?” [Satan] said, “I am better than him. You created me from fire and created him from clay.”
Meaning:-
Prostrate: lying stretched out on the ground with one’s face downward, especially in reverence or submission.
Clay: thick, heavy soil that is soft when wet, and hard when dry or baked, Clay is a kind of earth that is soft when it is wet and hard when it is dry.