1 Samuel 15:12-16

Samuel got up early in the morning to meet Saul; and it was reported to Samuel, saying, “Saul came to Carmel, and behold, he set up a monument for himself, then turned and proceeded on down to Gilgal.”

So 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 bellowing 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 completely destroyed.”

Then Samuel said to Saul, “Stop, and let me inform you of what the Lord said to me last night.” And he said to him, “Speak!”