1 Samuel 15:5-6

And Saul came to a city of Amalek, and laid wait in the valley. {laid...: or, fought} And Saul said unto the Kenites, Go, depart, get you 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. So the Kenites departed from among the Amalekites.