Ephesians 5:28-31

He that loveth his wife, loveth himself. St. Paul would have this a love like that which a man hath for himself, or for his own flesh, when they are now joined in wedlock, and are become as it were one flesh and one person, as a civil life and society. See Matthew xix. 5. The wife is to be considered as a part of the husband, as a member of his body, of his flesh, and of his bones. The words are to be taken with an allusion to what Adam said, (Genesis ii. 23.) This is now bone of my bones, &c. And so, according to the apostle, speaking figuratively, the Church, which is the spouse of Christ, is framed as it were of his bones and of his flesh sacrificed on the cross. (Witham)