Numbers 36:6 KJV
This is the thing which the Lord doth command concerning the daughters of Zelophehad, saying, Let them marry to whom they think best; only to the family of the tribe of their father shall they marry.
Numbers 36:6, King James Version
In context
5 And Moses commanded the children of Israel according to the word of the Lord, saying, The tribe of the sons of Joseph hath said well.
6 This is the thing which the Lord doth command concerning the daughters of Zelophehad, saying, Let them marry to whom they think best; only to the family of the tribe of their father shall they marry.
7 So shall not the inheritance of the children of Israel remove from tribe to tribe: for every one of the children of Israel shall keep himself to the inheritance of the tribe of his fathers.