Numbers 36:6-9

6This is what the Lord has commanded about the daughters of Zelophehad: Let them marry men that they want to marry. But they must marry men from the clans of their father's tribe.

7If they do that, each tribe will keep the land that has been given to their ancestors. None of their land will go to another tribe.

8Any young woman who receives land when her father dies must marry a man from her father's tribe. All the Israelite tribes must obey that rule. Then every Israelite person will keep the land that belonged to his ancestors.

9No land that belongs to any tribe will become the land of another tribe. So each tribe will keep the land that their ancestors had.’