Sherah could scarcely herself have built the Palestinian cities here mentioned, which must belong to a time not earlier than Joshua. By "she built" we must understand "her descendants built."

His daughter was Sherah - That is, remnant; "called so," says the Targum, "because she was the remnant that escaped from the slaughter mentioned above."

And his daughter was Sherah,.... That is, the daughter of Beriah; not an immediate daughter, but a descendant of his, otherwise she could not have reached the times of Joshua, as she did by what follows:
who built Bethhoron the nether, and the upper; which were cities on the border of the tribe of Ephraim; which the Israelites having taken from the Canaanites, and destroyed, she rebuilt, see Joshua 16:3.
and Uzzensherah; which was called after her own name, and to distinguish it from another place called Uzzen; though of neither of them do we read elsewhere.

"And his daughter Sherah," the daughter of the above-mentioned Ephraim, "built Beth-horon the nether and the upper," the present Beit-Ur-Fok and Tachta (see on Joshua 10:10), "and Uzzen-sherah," a place not elsewhere referred to, which she probably founded, and which was called after her. The building of the two Beth-horons is merely an enlarging and fortifying of these towns. Sherah was probably an heiress, who had received these places as her inheritance, and caused them to be enlarged by her family. In 1-Chronicles 7:25-27 the ancestors of Joshua the son of Nun, who brought Israel into the land of Canaan, are enumerated. As the word בּנו is wanting after רשׁף, we must hold Rephah and Resheph to be brothers, but we are not informed from which of the four Ephraimite stocks enumerated in Numbers 26:35. they were descended. "Telah his son," Bertheau holds to be a son of Rephah. The name Tahan occurs in Numbers 26:35 as that of the founder of one of the families of Ephraim; but he can hardly be identical with our Tahan, who was probably a son of that Tahan from whom an Ephraimite family descended. If this conjecture be correct, Joshua would be of the family of Tahan.