Numbers 36:6

This is the thing which Jehovah hath commanded concerning the daughters of Zelophehad, saying, Let them marry whom they please; only they shall marry one of the tribe of their father,

Genesis 24:57-58

And they said, Let us call the maiden and inquire at her mouth.

Numbers 36:12

To those that were of the families of the sons of Manasseh the son of Joseph were they married; and their inheritance remained in the tribe of the family of their father.

Genesis 24:3

and I will make thee swear by Jehovah, the God of the heavens and the God of the earth, that thou take not a wife for my son of the daughters of the Canaanites, among whom I am dwelling;

2 Corinthians 6:14

Be not diversely yoked with unbelievers; for what participation is there between righteousness and lawlessness? or what fellowship of light 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
To those that were of the families of the sons of Manasseh the son of Joseph were they married; and their inheritance remained in the tribe of the family of their father.
Genesis 24:3
and I will make thee swear by Jehovah, the God of the heavens and the God of the earth, that thou take not a wife for my son of the daughters of the Canaanites, among whom I am dwelling;
2 Corinthians 6:14
Be not diversely yoked with unbelievers; for what participation is there between righteousness and lawlessness? or what fellowship of light with darkness?