1 Samuel 15:1-6

1And Samuel said to Saul, Jehovah sent me to anoint thee king over his people, over Israel: now therefore hearken to the voice of the words of Jehovah.

2Thus saith Jehovah of hosts: I have considered what Amalek did to Israel, how he set himself against him in the way, when he came up from Egypt.

3Now go and smite Amalek, and destroy utterly all that they have, and spare them not, but slay both man and woman, infant and suckling, ox and sheep, camel and ass.

4And Saul summoned the people, and numbered them in Telaim, two hundred thousand footmen, and ten thousand men of Judah.

5And Saul came to the city of the Amalekites, and set an ambush in the valley.

6And Saul said to the Kenites, Go, depart, and go down from among the Amalekites, lest I destroy you with them; for ye shewed kindness to all the children of Israel when they came up out of Egypt. And the Kenites departed from among the Amalekites.