1 Samuel 15:5-9

And Saul came to the city of Amalek and set an ambush in the wadi.

But Saul said to the Kenites, “Go, get away, go down from among the Amalekites, so that I do not destroy you along with them; for you showed kindness to all the sons of Israel when they went up from Egypt.” So the Kenites got away from among the Amalekites.

Then Saul defeated the Amalekites, from Havilah going toward Shur, which is east of Egypt.

He captured Agag the king of the Amalekites alive, and completely destroyed all the people with the edge of the sword.

But Saul and the people spared Agag and the best of the sheep, the oxen, the more valuable animals, the lambs, and everything that was good, and were unwilling to destroy them completely; but everything despicable and weak, that they completely destroyed. Samuel Rebukes Saul