Charles Ellicott Commentary 1 Samuel 15:14

"And Samuel said, What meaneth then this bleating of the sheep in mine ears, and the lowing of the oxen which I hear?" — 1 Samuel 15:14 (ASV)

What meaneth then this bleating? ... — “Saul is convicted of falsehood by the voices of the animals which he has spared, contrary to God’s command. Samuel’s mode of citing them against him by the question, ‘What meaneth these voices?’ has an air of holy humour and cutting irony.” — Lange.