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?