From there the boundary passes along southward in the direction of Luz, to the shoulder of Luz (that is, Bethel), then the boundary goes down to Ataroth-addar, on the mountain that lies south of Lower Beth-horon.
Benjamin lay between Judah and Joseph by God's wise ordering: little Benjamin needed Joseph's strength nearby, yet the Lord Himself covered him all the day long. This position later bound Benjamin to Judah in loyalty to David's throne and Jerusalem's temple, as Providence had appointed.
AI summary
Commenting on Joshua 18:11-28
And the border went over from thence towards Luz,.... From Bethaven, where the northern border ended, the western began, and went on to Luz: to the side of Luz, which is Bethel, southward; that is, passed along, leaving that city to the south, which formerly was called Luz, but now Bethel, which though distinct places formerly, yet being very near, might in process of time...
And the border went over from thence toward Luz, to the side of Luz, which [is] Bethel, southward; and the border descended to Atarothadar, near the hill that [lieth] on the south side of the nether Bethhoron. (k) Which was in the tribe of Ephraim: another Bethel was in the tribe of Benjamin.