1 Samuel 15:15-16
15:15 Saul said, “They were brought from the Amalekites; the army spared the best of the flocks and cattle to sacrifice to the Lord our God. But everything else we slaughtered.”
15:16 Then Samuel said to Saul, “Wait a minute! Let me tell you what the Lord said to me last night.” Saul said to him, “Tell me.”