Nehemiah 9:2
Those of Israelite descent separated themselves from all the foreigners, and they stood and confessed their sins and the iniquities of their fathers.

Leviticus 26:40-42
But if they will confess their iniquity and that of their fathers in the unfaithfulness that they practiced against Me, by which they have also walked in hostility toward Me— / and I acted with hostility toward them and brought them into the land of their enemies—and if their uncircumcised hearts will be humbled and they will make amends for their iniquity, / then I will remember My covenant with Jacob and My covenant with Isaac and My covenant with Abraham, and I will remember the land.

2 Chronicles 30:15
And on the fourteenth day of the second month they slaughtered the Passover lamb. The priests and Levites were ashamed, and they consecrated themselves and brought burnt offerings to the house of the LORD.

Nehemiah 13:23-27
In those days I also saw Jews who had married women from Ashdod, Ammon, and Moab. / Half of their children spoke the language of Ashdod or of the other peoples, but could not speak the language of Judah. / I rebuked them and called down curses on them. I beat some of these men and pulled out their hair. Then I made them take an oath before God and said, “You must not give your daughters in marriage to their sons or take their daughters as wives for your sons or for yourselves! ...

Malachi 2:11-12
Judah has broken faith; an abomination has been committed in Israel and in Jerusalem. For Judah has profaned the LORD’s beloved sanctuary by marrying the daughter of a foreign god. / As for the man who does this, may the LORD cut off from the tents of Jacob everyone who is awake and aware—even if he brings an offering to the LORD of Hosts.

2 Corinthians 6:14-18
Do not be unequally yoked with unbelievers. For what partnership can righteousness have with wickedness? Or what fellowship does light have with darkness? / What harmony is there between Christ and Belial? Or what does a believer have in common with an unbeliever? / What agreement can exist between the temple of God and idols? For we are the temple of the living God. As God has said: “I will dwell with them and walk among them, and I will be their God, and they will be My people.” ...

Deuteronomy 7:3-4
Do not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons, / because they will turn your sons away from following Me to serve other gods. Then the anger of the LORD will burn against you, and He will swiftly destroy you.

1 Corinthians 7:10-16
To the married I give this command (not I, but the Lord): A wife must not separate from her husband. / But if she does, she must remain unmarried or else be reconciled to her husband. And a husband must not divorce his wife. / To the rest I say this (I, not the Lord): If a brother has an unbelieving wife and she is willing to live with him, he must not divorce her. ...

1 Kings 11:1-4
King Solomon, however, loved many foreign women along with the daughter of Pharaoh—women of Moab, Ammon, Edom, and Sidon, as well as Hittite women. / These women were from the nations about which the LORD had told the Israelites, “You must not intermarry with them, for surely they will turn your hearts after their gods.” Yet Solomon clung to these women in love. / He had seven hundred wives of royal birth and three hundred concubines—and his wives turned his heart away. ...

Matthew 5:32
But I tell you that anyone who divorces his wife, except for sexual immorality, brings adultery upon her. And he who marries a divorced woman commits adultery.

Deuteronomy 24:1-4
If a man marries a woman, but she becomes displeasing to him because he finds some indecency in her, he may write her a certificate of divorce, hand it to her, and send her away from his house. / If, after leaving his house, she goes and becomes another man’s wife, / and the second man hates her, writes her a certificate of divorce, hands it to her, and sends her away from his house, or if he dies, ...

1 Corinthians 5:1-2
It is actually reported that there is sexual immorality among you, and of a kind that is intolerable even among pagans: A man has his father’s wife. / And you are proud! Shouldn’t you rather have been stricken with grief and have removed from your fellowship the man who did this?

Exodus 34:15-16
Do not make a covenant with the inhabitants of the land, for when they prostitute themselves to their gods and sacrifice to them, they will invite you, and you will eat their sacrifices. / And when you take some of their daughters as brides for your sons, their daughters will prostitute themselves to their gods and cause your sons to do the same.

Romans 7:2-3
For instance, a married woman is bound by law to her husband as long as he lives. But if her husband dies, she is released from the law of marriage. / So then, if she is joined to another man while her husband is still alive, she is called an adulteress; but if her husband dies, she is free from that law and is not an adulteress if she marries another man.

Joshua 23:12-13
For if you turn away and cling to the rest of these nations that remain among you, and if you intermarry and associate with them, / know for sure that the LORD your God will no longer drive out these nations before you. Instead, they will become for you a snare and a trap, a scourge in your sides and thorns in your eyes, until you perish from this good land that the LORD your God has given you.