Numbers 36:6

This the word which Jehovah commanded to the daughters of Zelophehad, saying, To the good in their eyes they shall be for wives; only to the families of the tribe of their fathers shall they be for wives.

Genesis 24:57-58

And they will say, We will, call to the girl, and ask her mouth.

Numbers 36:12

To some of the families of the sons of Manasseh, son of Joseph, they were for wives, and their inheritance shall be to the tribe of the families of their fathers.

Genesis 24:3

And I will cause thee to swear by Jehovah, God of the heavens, and God of the earth, that thou wilt not take a wife to my son, from the daughters of the Canaanites in the midst of whom I shall dwell.

2 Corinthians 6:14

Be not unequally yoked together with the unbelieving: for what participation to justice and iniquity and what communion to 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 some of the families of the sons of Manasseh, son of Joseph, they were for wives, and their inheritance shall be to the tribe of the families of their fathers.
Genesis 24:3
And I will cause thee to swear by Jehovah, God of the heavens, and God of the earth, that thou wilt not take a wife to my son, from the daughters of the Canaanites in the midst of whom I shall dwell.
2 Corinthians 6:14
Be not unequally yoked together with the unbelieving: for what participation to justice and iniquity and what communion to light with darkness?