Stanley Arthur Cook, 1911 Encyclopædia Britannica, Volume 15… (1911)
“ Indeed, underlying the account of the Israelite exodus (q.v.) there are traces of a separate movement of certain clans—apart from the Israelite invasion of Palestine—who are ultimately found in the south of Judah; and the traditions in Chronicles themselves allow the view that the incorporation of these elements began under David, when Judah first occupies a prominent position in biblical history (cf. Cheyne, Ency. Bib., col. 2618 seq., and see Caleb, Jerahmeel, Kenites) . ”
