1 Corinthians 6:16 in the King James Version
What? know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh.
Context
15 Don’t you know that your bodies are members of Christ? Shall I then take the members of Christ and make them members of a prostitute? May it never be!
16 Or don’t you know that he who is joined to a prostitute is one body? For, “The two”, he says, “will become one flesh.”
17 But he who is joined to the Lord is one spirit.