Numbers 36:6

This is what the LORD is commanding the daughters of Zelophehad: If they decide it's a good idea in their opinion to get married only within the family of their father's tribe, then let them get married

Genesis 24:57-58

But they said, "We'll call the young lady and see what she has to say about this."

Numbers 36:12

They married into families of the descendants of Manasseh, that is, Joseph's descendants, so that their inheritance remained within the tribe of their ancestor's family.

Genesis 24:3

as a promise to the LORD, the God of heaven and earth, that you won't acquire a wife for my son from the Canaanite women among whom I'm living.

2 Corinthians 6:14

Stop becoming unevenly yoked with unbelievers. What partnership can righteousness have with lawlessness? What fellowship can 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 married into families of the descendants of Manasseh, that is, Joseph's descendants, so that their inheritance remained within the tribe of their ancestor's family.
Genesis 24:3
as a promise to the LORD, the God of heaven and earth, that you won't acquire a wife for my son from the Canaanite women among whom I'm living.
2 Corinthians 6:14
Stop becoming unevenly yoked with unbelievers. What partnership can righteousness have with lawlessness? What fellowship can light have with darkness?

International Standard Version Copyright © 1996-2008 by the ISV Foundation.