1 Samuel 15:10-15

Then the word of the LORD came to Samuel, saying, “I regret that I have made Saul king, for he has turned back from following Me and has not carried out My commands.” And Samuel was distressed and cried out to the LORD all night. Samuel rose early in the morning to meet Saul; and it was told Samuel, saying, “Saul came to Carmel, and behold, he set up a monument for himself, then turned and proceeded on down to Gilgal.” Samuel came to Saul, and Saul said to him, “Blessed are you of the LORD! I have carried out the command of the LORD.” But Samuel said, “What then is this bleating of the sheep in my ears, and the lowing of the oxen which I hear?” Saul said, “They have brought them from the Amalekites, for the people spared the best of the sheep and oxen, to sacrifice to the LORD your God; but the rest we have utterly destroyed.”