They are to divide it among themselves into seven sections. Judah is to remain in his borders on the south, and the house of Joseph is to remain in their borders on the north. Bible

“divide it among themselves.” The verb is reflexive, and it indicates a degree of participation and agreement among the representatives from each tribe.

“Judah is to remain...Joseph is to remain.” Judah and Joseph had already received their territories at this time, and they were to remain in them and not expect a change of border.

Commentary for: Joshua 18:5