1 Samuel 15:4-9

4So Saul summoned the troops and numbered them at Telaim—200,000 foot soldiers and 10,000 men of Judah. 5Saul came to the city of Amalek and lay in wait in the valley. 6And he warned the Kenites, “Since you showed kindness to all the Israelites when they came up out of Egypt, go on and get away from the Amalekites. Otherwise I will sweep you away with them.”

So the Kenites moved away from the Amalekites.

7Then Saul struck down the Amalekites all the way from Havilah to Shur, which is east of Egypt. 8He captured Agag king of Amalek alive, but devoted all the others to destruction with the sword.

9Saul and his troops spared Agag, along with the best of the sheep and cattle, the fat calves1 and lambs, and the best of everything else. They were unwilling to devote them to destruction, but they devoted to destruction all that was despised and worthless.