1 Corinthians 6:15-17

15Do you not know that your bodies are members of Christ himself? Shall I then take the members of Christ and unite them with a prostitute? Never! 16Do you not know that he who unites himself with a prostitute is one with her in body? For it is said, “The two will become one flesh.” Gen. 2:24

17But whoever is united with the Lord is one with him in spirit. Or in the Spirit