Cross reference
Mark 10:8
8 And they twain shall be one flesh: so then they are no more twain, but one flesh.
1 Corinthians 6:16
16 What? know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh.
Genesis 2:24
24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
Ephesians 5:28
28 So ought men to love their wives as their own bodies. He that loveth his wife loveth himself.