Numbers 36:6-8 NIV

6 This is what the LORD commands for Zelophehad's daughters: They may marry anyone they please as long as they marry within the tribal clan of their father.
7 No inheritance1 in Israel is to pass from tribe to tribe, for every Israelite shall keep the tribal land inherited from his forefathers.

References for Numbers 36:7

8 Every daughter who inherits land in any Israelite tribe must marry someone in her father's tribal clan,2 so that every Israelite will possess the inheritance of his fathers.

References for Numbers 36:8