The Kenites came from the desert, and were apparently of Midianitish
descent. Balaam had looked down upon their rocky strongholds from the
heights of Moab; and they had accompanied their Hebrew comrades of Judah
from their first camping-ground near Jericho to the wilderness south of
Arad. Here they lived among the Amalekite Bedâwin down to the days of
Saul. To the last they maintained their nomadic habits, and the Kenite
family of Rechab still dwelt in tents and avoided wine in that later age
when the kingdom of Judah was about to fall.[3]

The Edomite element in Judah was stronger than the Kenite. It consisted
of the two clans of Jerahmeel and Kenaz, or the house of Caleb as it was
called in the time of David.[4] Kenaz was a grandson of Esau, and the
fact that the Kenizzites shared with the Israelitish tribes in the
conquest of Canaan throws light on the law of Deuteronomy[5] which gave
the Edomite of "the third generation" all the rights and privileges of a
Jew. Caleb, the conqueror of Hebron, was a Kenizzite; so also was
Othniel, the first of the Judges of Israel. Edomites, rather than
Hebrews, were the founders of the future Judah.

This accounts for the comparatively late appearance of Judah as a
separate tribe in the history of Israel, as well as for the antagonism
which existed between it and the more pure-blooded tribes of the north.
In the Song of Deborah and Barak, Judah is not mentioned; Ephraim and
Benjamin, and not Judah, are still regarded as forming the bulwark of
Israel against the Amalekite marauders of the southern wilderness. It
was the Philistine wars which first created the Judah of later days.
They forced Hebrews, Edomites, and Kenites to unite against the common
enemy, and welded them into a single whole. Though the three peoples
still continued to be spoken of separately, this was but a survival of