1 Samuel 15:9-19

9 Saul and the people spared Agag, and the best of the sheep and of the cattle and of the fatlings, and the lambs, and all that was valuable, and would not utterly destroy them; all that was despised and worthless they utterly destroyed.
10 The word of the Lord came to Samuel:
11 "I regret that I made Saul king, for he has turned back from following me, and has not carried out my commands." Samuel was angry; and he cried out to the Lord all night.
12 Samuel rose early in the morning to meet Saul, and Samuel was told, "Saul went to Carmel, where he set up a monument for himself, and on returning he passed on down to Gilgal."
13 When Samuel came to Saul, Saul said to him, "May you be blessed by the Lord; I have carried out the command of the Lord."
14 But Samuel said, "What then is this bleating of sheep in my ears, and the lowing of cattle that I hear?"
15 Saul said, "They have brought them from the Amalekites; for the people spared the best of the sheep and the cattle, to sacrifice to the Lord your God; but the rest we have utterly destroyed."
16 Then Samuel said to Saul, "Stop! I will tell you what the Lord said to me last night." He replied, "Speak."
17 Samuel said, "Though you are little in your own eyes, are you not the head of the tribes of Israel? The Lord anointed you king over Israel.
18 And the Lord sent you on a mission, and said, "Go, utterly destroy the sinners, the Amalekites, and fight against them until they are consumed.'
19 Why then did you not obey the voice of the Lord? Why did you swoop down on the spoil, and do what was evil in the sight of the Lord?"
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.