1 Samuel 15:10-18

Then the word of the LORD came to Samuel: “I regret that I have made Saul king, because he has turned away from me and has not carried out my instructions.” Samuel was angry, and he cried out to the LORD all that night. Early in the morning Samuel got up and went to meet Saul, but he was told, “Saul has gone to Carmel. There he has set up a monument in his own honor and has turned and gone on down to Gilgal.” When Samuel reached him, Saul said, “The LORD bless you! I have carried out the LORD’s instructions.” But Samuel said, “What then is this bleating of sheep in my ears? What is this lowing of cattle that I hear?” Saul answered, “The soldiers brought them from the Amalekites; they spared the best of the sheep and cattle to sacrifice to the LORD your God, but we totally destroyed the rest.” “Enough!” Samuel said to Saul. “Let me tell you what the LORD said to me last night.” “Tell me,” Saul replied. Samuel said, “Although you were once small in your own eyes, did you not become the head of the tribes of Israel? The LORD anointed you king over Israel. 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.’