Numbers 36:6
This is the order of the Lord about the daughters of Zelophehad: The Lord says, Let them take as their husbands whoever is most pleasing to them, but only among the family of their father's tribe.
Genesis 24:57-58
And they said, We will send for the girl, and let her make the decision.
Numbers 36:12
And were married into the families of the sons of Manasseh, the son of Joseph, and their property was kept in the tribe of their father's family
Genesis 24:3
And take an oath by the Lord, the God of heaven and the God of the earth, that you will not get a wife for my son Isaac from the daughters of the Canaanites among whom I am living;
2 Corinthians 6:14
Do not keep company with those who have not faith: for what is there in common between righteousness and evil, or between light and dark?