Numbers 36:6

This is the thing which Jehovah commands concerning the daughters of Zelophehad, saying, Let them marry to whom they think best. Only they shall marry into the family of the tribe of their father.

Genesis 24:57-58

And they said, We will call the young woman and inquire at her mouth.

Numbers 36:12

They were married into the families 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 you swear by Jehovah, the God of Heaven and the God of the earth, that you shall not take a wife to my son of the daughters of the Canaanites, among whom I dwell.

2 Corinthians 6:14

Do not be unequally yoked together with unbelievers; for what fellowship does righteousness have with lawlessness? And what partnership 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 married into the families 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 you swear by Jehovah, the God of Heaven and the God of the earth, that you shall not take a wife to my son of the daughters of the Canaanites, among whom I dwell.
2 Corinthians 6:14
Do not be unequally yoked together with unbelievers; for what fellowship does righteousness have with lawlessness? And what partnership does light have with darkness?