1st Samuel 15:16

13 And Samuel came to Saul; and Saul said to him, May the blessing of the Lord be with you: I have done what was ordered by the Lord.

14 And Samuel said, What then is this sound of the crying of sheep and the noise of oxen which comes to my ears?

15 And Saul said, They have taken them from the Amalekites: for the people have kept the best of the sheep and of the oxen as an offering to the Lord your God; all the rest we have given up to destruction.

16 Then Samuel said to Saul, Say no more! Let me give you word of what the Lord has said to me this night. And he said to him, Say on.

17 And Samuel said, Though you may seem little to yourself, are you not head of the tribes of Israel? for the Lord with the holy oil made you king over Israel,

18 And the Lord sent you on a journey and said, Go and put to the curse those sinners, the Amalekites, fighting against them till every one is dead.

19 Why then did you not do the orders of the Lord, but by violently taking their goods did evil in the eyes of the Lord?