Joshua 18:13-14

Then the border continued southward toward Luz, to the slope of Luz (that is, Bethel); then the border went down to Ataroth-addar, by the hill that lies south of lower Beth-horon. The border changed course [from there] and turned around on the western side southward, from the hill that lies to the south opposite Beth-horon; it ended at Kiriath-baal (that is, Kiriath-jearim), a city of [the tribe of] the sons of Judah. This formed the western side [of Benjamin’s territory].