Numbers 36:6-8

Amplified Bible

⁶ This is what the Lord commands regarding the daughters of Zelophehad: ‘Let them marry whom they wish; only they must marry within the family of the tribe of their father.’ ⁷ So no inheritance of the Israelites shall be transferred from tribe to tribe, for every one of the Israelites shall hold to the inheritance of the tribe of his fathers (tribal ancestors). ⁸ Every daughter who possesses an inheritance [of land] in any one of the tribes of the Israelites shall marry [only] a man whose family is of her father’s tribe, so that the Israelites may each possess the inheritance of his fathers (tribal ancestors).