1 Samuel 15:13-15

13Then Samuel went to Saul, and Saul said to him, “Blessed are you of the Lord! I have performed the commandment of the Lord.”

14But Samuel said, “What then is this bleating of the sheep in my ears, and the lowing of the oxen which I hear?”

15And Saul said, “They have brought them from the Amalekites; for the people spared the best of the sheep and the oxen, to sacrifice to the Lord your God; and the rest we have utterly destroyed.”