1 Samuel 15:19-23

19Why then did you not obey the voice of the Lord? Why did you pounce on the spoil and do what was evil in the sight of the Lord?"

20And Saul said to Samuel, "I have obeyed the voice of the Lord. I have gone on the mission on which the Lord sent me. I have brought Agag the king of Amalek, and I have devoted the Amalekites to destruction.

21But the people took of the spoil, sheep and oxen, the best of the things devoted to destruction, to sacrifice to the Lord your God in Gilgal."

22And Samuel said, "Has the Lord as great delight in burnt offerings and sacrifices, as in obeying the voice of the Lord? Behold, to obey is better than sacrifice, and to listen than the fat of rams.

23For rebellion is as the sin of divination, and presumption is as iniquity and idolatry. Because you have rejected the word of the Lord, he has also rejected you from being king."