1 Samuel 15:2-3

2Thus says the Lord of hosts: ‘I will punish Amalek for what he did to Israel, how he ambushed him on the way when he came up from Egypt.

3Now go and attack Amalek, and utterly destroy all that they have, and do not spare them. But kill both man and woman, infant and nursing child, ox and sheep, camel and donkey.’ ”