1 Samuel 15:6

Kenites — A people descending from, or nearly related to Jethro, who anciently dwelt in rocks near the Amalekites, Numbers 24:21, and afterwards some of them dwelt in Judah, Judges 1:16, whence it is probable they removed, (which, dwelling in tents, they could easily do) and retired to their old habitation, because of the wars and troubles wherewith Judah was annoyed. Shewed kindness — Some of your progenitors did so, and for their sakes all of you shall fare the better. You were not guilty of that sin for which Amalek is now to be destroyed. When destroying judgments are abroad God takes care to separate the precious from the vile. It is then especially dangerous to be found in the company of God's enemies. The Jews have a saying, Wo to a wicked man, and to his neighbour.