1 Samuel 15:19

17Samuel 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;

18and 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.’

19Why then didn’t you obey the LORD’s voice, but took the plunder, and did that which was evil in the LORD’s sight?”

20Saul said to Samuel, “But I have obeyed the LORD’s voice, and have gone the way which the LORD sent me, and have brought Agag the king of Amalek, and have utterly destroyed the Amalekites.

21But the people took of the plunder, sheep and cattle, the best of the devoted things, to sacrifice to the LORD your God in Gilgal.”