1 Samuel 15:1-3

Then Samuel said to Saul, “The LORD sent me to anoint you as king over His people, over Israel; now therefore, listen to the words of the LORD. Thus says the LORD of hosts, ‘I will punish Amalek for what he did to Israel, how he set himself against him on the way while he was coming up from Egypt. Now go and strike Amalek and utterly destroy all that he has, and do not spare him; but put to death both man and woman, child and infant, ox and sheep, camel and donkey.’ ”