1 Samuel 15:16-19

16Then Samuel said to Saul, “Stop, and let me tell you what the Lord said to me last night.” Saul said to him, “Speak.”

17Samuel said, “Is it not true that even though you were small (insignificant) in your own eyes, you were made the head of the tribes of Israel? And the Lord anointed you king over Israel,

18and the Lord sent you on a mission, and said, ‘Go, totally destroy the sinners, the Amalekites, and fight against them until they are eliminated.’

19Why did you not obey the voice of the Lord, but [instead] swooped down on the plunder [with shouts of victory] and did evil in the sight of the Lord?”