The New John Gill Exposition of the Entire BibleEphesians 5:31
For this cause shall a man leave his father and mother,
&c.] These words contain the law of marriage, and are cited from
(Genesis 2:24) ; and declare what ought to be, and are a prophecy of what
should be; and are observed against polygamy, and to stir up mutual
affection; (See Gill on 19:5).