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.

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.

1 Samuel 14:1-3
One day Jonathan son of Saul said to the young man bearing his armor, “Come, let us cross over to the Philistine outpost on the other side.” But Jonathan did not tell his father. / Meanwhile, Saul was staying under the pomegranate tree in Migron on the outskirts of Gibeah. And the troops who were with him numbered about six hundred men, / including Ahijah, who was wearing an ephod. He was the son of Ichabod’s brother Ahitub son of Phinehas, the son of Eli the priest of the LORD in Shiloh. But the troops did not know that Jonathan had left.

1 Kings 11:1-2
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.

Ezra 9:12
Now, therefore, do not give your daughters in marriage to their sons or take their daughters for your sons. Never seek their peace or prosperity, so that you may be strong and may eat the good things of the land, leaving it as an inheritance to your sons forever.’

Nehemiah 13:25-27
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! / Did not King Solomon of Israel sin in matters like this? There was not a king like him among many nations, and he was loved by his God, who made him king over all Israel—yet foreign women drew him into sin. / Must we now hear that you too are doing all this terrible evil and acting unfaithfully against our God by marrying foreign women?”

Genesis 24:3-4
and I will have you swear by the LORD, the God of heaven and the God of earth, that you will not take a wife for my son from the daughters of the Canaanites among whom I am dwelling, / but will go to my country and my kindred to take a wife for my son Isaac.”

Exodus 34:16
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.

Leviticus 18:24-30
Do not defile yourselves by any of these practices, for by all these things the nations I am driving out before you have defiled themselves. / Even the land has become defiled, so I am punishing it for its sin, and the land will vomit out its inhabitants. / But you are to keep My statutes and ordinances, and you must not commit any of these abominations—neither your native-born nor the foreigner who lives among you. ...

Numbers 36:6-9
This is what the LORD has commanded concerning the daughters of Zelophehad: They may marry anyone they please, provided they marry within a clan of the tribe of their father. / No inheritance in Israel may be transferred from tribe to tribe, because each of the Israelites is to retain the inheritance of the tribe of his fathers. / Every daughter who possesses an inheritance from any Israelite tribe must marry within a clan of the tribe of her father, so that every Israelite will possess the inheritance of his fathers. ...

2 Corinthians 6:14-17
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.” ...

Matthew 22:30
In the resurrection, people will neither marry nor be given in marriage. Instead, they will be like the angels in heaven.

1 Corinthians 7:39
A wife is bound to her husband as long as he lives. But if her husband dies, she is free to marry anyone she wishes, as long as he belongs to the Lord.

1 Corinthians 9:5
Have we no right to take along a believing wife, as do the other apostles and the Lord’s brothers and Cephas?

1 Timothy 5:14
So I advise the younger widows to marry, have children, and manage their households, denying the adversary occasion for slander.