1 Samuel 15:18-20

And the LORD sent you on a mission and told you, ‘Go and completely destroy the sinners, the Amalekites, until they are all dead.’ Why haven’t you obeyed the LORD? Why did you rush for the plunder and do what was evil in the LORD’s sight?” “But I did obey the LORD,” Saul insisted. “I carried out the mission he gave me. I brought back King Agag, but I destroyed everyone else.