1 Samuel 15:18-20

And he sent you on a mission, saying, ‘Go and completely destroy those wicked people, the Amalekites; wage war against them until you have wiped them out.’ Why did you not obey the LORD? Why did you pounce on the plunder and do evil in the eyes of the LORD?” “But I did obey the LORD,” Saul said. “I went on the mission the LORD assigned me. I completely destroyed the Amalekites and brought back Agag their king.