1 Samuel 15:18 in the King James Version
And the LORD sent thee on a journey, and said, Go and utterly destroy the sinners the Amalekites, and fight against them until they be consumed.
Context
17 Samuel said, “Though you were little in your own sight, weren’t you made the head of the tribes of Israel? The LORD anointed you king over Israel;
18 and the LORD sent you on a journey, and said, ‘Go, and utterly destroy the sinners the Amalekites, and fight against them until they are consumed.’
19 Why then didn’t you obey the LORD’s voice, but took the plunder, and did that which was evil in the LORD’s sight?”