1 Samuel 15:20-23

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 LORD ? To obey is better than sacrifice, and to heed is better than the fat of rams.

23For rebellion is like the sin of divination, and arrogance like the evil of idolatry. Because you have rejected the word of the LORD, he has rejected you as king.”