1 Samuel 15:20

Samuel said, “Though you were little in your own sight, weren’t you made the head of the tribes of Israel? The LORD anointed you king over Israel;

and the LORD sent you on a journey, and said, ‘Go, and utterly destroy the sinners the Amalekites, and fight against them until they are consumed.’

Why then didn’t you obey the LORD’s voice, but took the plunder, and did that which was evil in the LORD’s sight?”

But the people took of the plunder, sheep and cattle, the best of the devoted things, to sacrifice to the LORD your God in Gilgal.”

Samuel said, “Has the LORD as great delight in burnt offerings and sacrifices, as in obeying the LORD’s voice? Behold, to obey is better than sacrifice, and to listen than the fat of rams.

For rebellion is as the sin of witchcraft, and stubbornness is as idolatry and teraphim. Because you have rejected the LORD’s word, he has also rejected you from being king.”