Numbers 36:6

This is the thing which the LORD commands concerning the daughters of Zelophehad, saying, Let them marry as they desire; but they shall marry only within the family of the tribe of their father

Genesis 24:57-58

Then they said, We will call the damsel and enquire at her mouth.

Numbers 36:12

They were women of the family of the sons of Manasseh, the son of Joseph, and their inheritance remained in the tribe of the family of their father.

Genesis 24:3

and I will make thee swear by the LORD, the God of the heavens and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell;

2 Corinthians 6:14

Be ye not unequally yoked together with unbelievers, for what fellowship does righteousness have with unrighteousness? and what communion does light have with darkness?

Treasury of Scripture Knowledge

Summary

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.

Bible References

Only to the family

Numbers 36:12
They were women of the family of the sons of Manasseh, the son of Joseph, and their inheritance remained in the tribe of the family of their father.
Genesis 24:3
and I will make thee swear by the LORD, the God of the heavens and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell;
2 Corinthians 6:14
Be ye not unequally yoked together with unbelievers, for what fellowship does righteousness have with unrighteousness? and what communion does light have with darkness?