Koz fathered Anub, Zobebah, and the clans of Aharhel, the son of Harum.
One reason, no doubt, why Ezra is here most particular in the register of the tribe of Judah is because it was that tribe which, with its appendages, Simeon, Benjamin, and Levi, made up the kingdom of Judah, which not only long survived the other tribes in Canaan, but in process of time, now when this was written, returned out of captivity, when the generality...
Commenting on 1 Chronicles 4:1-10
And Coz,.... Another son of Helah, and brother of the before mentioned: begat Anub, and Zobebah; of whom we nowhere else read: and the families of Aharhel, the son of Harum; these were of the posterity of Coz; the Targum is, "and the family of Aharhel, this is Hur, the firstborn of Miriam;''which is not at all probable.
The son of Harum - Jabez should be mentioned at the end of this verse, else he is as a consequent without an antecedent.