Mark 10:8

and the two shall become one flesh: so that they are no more two, but one flesh.

1 Corinthians 6:16

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

Genesis 2:24

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

Even so ought husbands also to love their own wives as their own bodies. He that loveth his own 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
Or know ye not that he that is joined to a harlot is one body? for, The twain, saith he, shall become one flesh.
Ephesians 5:28
Even so ought husbands also to love their own wives as their own bodies. He that loveth his own wife loveth himself:

General references

Ephesians 5:31
For this cause shall a man leave his father and mother, and shall cleave to his wife; and the two shall become one flesh.

American Standard Version Public Domain