In 1 Corinthians 6:17, NIV But he who unites himself with the Lord is one with him in spirit.
Do not unite one’s body with a prostitute vs 15-20.
1 Corinthians 6:15-20
[15]You know that your bodies are parts of the body of Christ. Shall I take a part of Christ’s body and make it part of the body of a prostitute? Impossible!
[16]Or perhaps you don’t know that the man who joins his body to a prostitute becomes physically one with her? The scripture says quite plainly, “The two will become one body.”
[17]But he who joins himself to the Lord becomes spiritually one with him.
[18]Avoid immorality. Any other sin a man commits does not affect his body; but the man who is guilty of sexual immorality sins against his own body.
[19]Don’t you know that your body is the temple of the Holy Spirit, who lives in you and who was given to you by God? You do not belong to yourselves but to God;
[20]he bought you for a price. So use your bodies for God’s glory.