Numbers 34:14

34:14 because the tribe of the Reubenites by their families, the tribe of the Gadites by their families, and half of the tribe of Manasseh have received their inheritance.

Numbers 36:6

36:6 This is what the Lord has commanded for Zelophehad’s daughters: ‘Let them marry whomever they think best, only they must marry within the family of their father’s tribe.