1 Corinthians 6:16

What? know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh.
— 1 Corinthians 6:16, King James Version

In other translations

World English Bible (WEB)

Or don't you know that he who is joined to a prostitute is one body? For, "The two," says he, "will become one flesh."

American Standard Version (ASV)

Or know ye not that he that is joined to a harlot is one body? for, The twain, saith he, shall become one flesh.

Young's Literal Translation (YLT)

have ye not known that he who is joined to the harlot is one body? 'for they shall be--saith He--the two for one flesh.'