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 who is united to the harlot is one body? For, "the two", He saith, "shall be one flesh";

Ephesians 5:28

So ought husbands also to love their own wives as their own bodies. He who loves his own wife loves 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 who is united to the harlot is one body? For, "the two", He saith, "shall be one flesh";
Ephesians 5:28
So ought husbands also to love their own wives as their own bodies. He who loves his own wife loves himself;

General references

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