Unequally Yoked
Do not be unequally yoked together with unbelievers.
2 Corinthians 6:14 (NKJV)

For what fellowship has righteousness with lawlessness? And what communion has light with darkness? And what accord has Christ with Belial? Or what part has a believer with an unbeliever? And what agreement has the temple of God with idols? For you are the temple of the living God. As God has said: “I will dwell in them and walk among them. I will be their God, and they shall be My people.”
2 Corinthians 6:15-16 (NKJV)

Therefore, “Come out from among them and be separate, says the Lord. Do not touch what is unclean, and I will receive you. I will be a Father to you, and you shall be My sons and daughters,” says the Lord Almighty.
2 Corinthians 6:17-18 (NKJV)

Do you not know that your bodies are members of Christ? Shall I then take away the members of Christ and make them members of a prostitute? May it never be!
1 Corinthians 6:15 (NASB)

Or do you not know that the one who joins himself to a prostitute is one body with her? For He says, “The two shall become one flesh.”
1 Corinthians 6:16 (NASB)

Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and that you are not your own? For you have been bought with a price: therefore glorify God in your body.
1 Corinthians 6:19-20 (NASB)