1 Samuel 15:1-6

1Then Samuel said to Saul, “The LORD sent me to anoint you king over His people Israel. Now therefore, listen to the words of the LORD. 2This is what the LORD of Hosts says: ‘I witnessed what the Amalekites did to the Israelites when they opposed them on their way up from Egypt. 3Now go and attack the Amalekites and devote to destruction1 all that belongs to them. Do not spare them, but put to death men and women, children and infants, oxen and sheep, camels and donkeys.’”

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.