Samuel said to Saul, I will not return with you; for you have rejected the word of Yahweh, and Yahweh has rejected you from being king over Israel.
For the Lord said, I remember the Amaleks that when you were trying to come into the land, they withstood you. And therefore God wants you to go down and utterly wipe out the Amaleks; every man, woman, child, animal. [Don't take anything back alive, utterly slay everything] ( 1 Samuel 15:2-3 ).