Joshua 22:19
For if the land of your possession is unclean, then cross over into the land of the possession of the LORD where the LORD's tabernacle stands, and take an inheritance among us. But do not rebel against the LORD or make us rebels by building an altar other than the altar of the LORD our God who is in Shiloh.' — The repetition of the concession (vv. 18-19) emphasizes its theological point: exclusive sanctuary law is non-negotiable. The western tribes are willing to accommodate the eastern tribes within their own territory if land-uncleanness is the issue, but they cannot tolerate unauthorized altar-building.