Numbers 36:7-9

7None of the territorial land may pass from tribe to tribe, for all the land given to each tribe must remain within the tribe to which it was first allotted.

8The daughters throughout the tribes of Israel who are in line to inherit property must marry within their tribe, so that all the Israelites will keep their ancestral property.

9No grant of land may pass from one tribe to another; each tribe of Israel must keep its allotted portion of land.”