Mark 10:8

consequently they are no longer two, but one person.

1 Corinthians 6:16

it cannot be. why, don't you perceive, that where there is such an attachment, they are but as one person? for the scripture says, "they two shall be as one."

Ephesians 5:28

in like manner ought men to love their wives, as their own bodies: "he that loves his wife, loveth himself."

Treasury of Scripture Knowledge

Summary

And they twain shall be one flesh: so then they are no more twain, but one flesh.

General references

Bible References

One flesh

1 Corinthians 6:16
it cannot be. why, don't you perceive, that where there is such an attachment, they are but as one person? for the scripture says, "they two shall be as one."
Ephesians 5:28
in like manner ought men to love their wives, as their own bodies: "he that loves his wife, loveth himself."

General references

Ephesians 5:31
the scripture says, "for this cause shall a man leave his father and mother, and shall be united to his wife, and they two shall be as one."