I Samuel 15:20, 24

And Saul said to Samuel, “But I have obeyed the voice of the LORD, and gone on the mission on which the LORD sent me, and brought back Agag king of Amalek; I have utterly destroyed the Amalekites.

Then Saul said to Samuel, “I have sinned, for I have transgressed the commandment of the LORD and your words, because I feared the people and obeyed their voice.