1 Samuel 15:17-19

17Samuel continued, “Although you once considered yourself unimportant, haven’t you become the leader of the tribes of Israel? The Lord anointed you king over Israel

18and then sent you on a mission and said, ‘Go and completely destroy the sinful Amalekites. Fight against them until you have annihilated them.’

19So why didn’t you obey the Lord? Why did you rush on the plunder and do what was evil in the Lord’s sight?”