1 Samuel 15 (NIV)
16"Stop!" Samuel said to Saul. "Let me tell you what the LORD said to me last night." "Tell me," Saul replied.
17Samuel 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.
18And he sent you on a mission, saying, 'Go and completely destroy those wicked people, the Amalekites; make war on them until you have wiped them out.'
19Why did you not obey the LORD? Why did you pounce on the plunder and do evil in the eyes of the LORD?"
20"But I did obey the LORD," Saul said. "I went on the mission the LORD assigned me. I completely destroyed the Amalekites and brought back Agag their king.
21The soldiers took sheep and cattle from the plunder, the best of what was devoted to God, in order to sacrifice them to the LORD your God at Gilgal."
22But Samuel replied: "Does the LORD delight in burnt offerings and sacrifices as much as in obeying the voice of the LORD? To obey is better than sacrifice, and to heed is better than the fat of rams.