1 Samuel 15:5-10

5Saul went to the city of Amalek and set an ambush in the ravine.

6Then he said to the Kenites, “Go away, leave the Amalekites so that I do not destroy you along with them; for you showed kindness to all the Israelites when they came up out of Egypt.” So the Kenites moved away from the Amalekites. 7Then Saul attacked the Amalekites all the way from Havilah to Shur, near the eastern border of Egypt. 8He took Agag king of the Amalekites alive, and all his people he totally destroyed with the sword.

9But Saul and the army spared Agag and the best of the sheep and cattle, the fat calves Or the grown bulls; the meaning of the Hebrew for this phrase is uncertain. and lambs—everything that was good. These they were unwilling to destroy completely, but everything that was despised and weak they totally destroyed. 10Then the word of the LORD came to Samuel: