And to them which were in Rachal, and to them which were in the cities of the Jerahmeelites, and to them which were in the cities of the Kenites, Them which were in Rachal - We know not where this place was; it is mentioned nowhere else in the Bible. Calmet conjectures that Hachilah, 1 Samuel 23:19, may be the same place; here we know David did conceal himself for some time, till the Ziphites endeavored to betray him to Saul.
The cities of the Jerahmeelites - See before, 1 Samuel 27:10 (note).
And - the cities of the Kenites - A very small tract on the southern coast of the Dead Sea.