What does 1 Samuel 15:6 mean?

He sent a message to the Kenites: 'Leave the Amalekites now, so I don’t destroy you along with them. You showed kindness to Israel when we came out of Egypt.' So the Kenites left. 1 Samuel 15:6 - Modern Text Bible

(Saul warns the Kenites to separate themselves from the Amalekites, sparing them because of their past kindness to Israel.)