פירוש על יהושע 18:13

From there the boundary passed—westward.

To Luz, the southside of Luz which is Beis El. [This is the city] that Yaakov called [Beis-el.] It is not the Beis-el which is near Ai, for it is said about the boundary of Yoseif: ‘And it extended from Beis-el to Luz.’⁷Chapter 16:2. Thus we learn that there were two [Beis-els]. Luz was not in the portion of Binyomin; for the boundary line was from Luz and within; as it is said: ‘To the southside of Luz.’ the boundary line goes south of Luz, thus Luz is outside the boundary line, and is within the inheritance of the Bnei Yoseif. Beis-el is in the portion of Binyomin; as it said later in this section.⁸See Verse 22.