Ephesians 5:30

Because we are members of his body. For this cause shall a man leave his father and mother, and shall cleave to his wife; and the two shall be one flesh.

Here (Ephesians 5:31) Paul quoted verbatim the passage from Genesis 2:24, making it the Scriptural basis of the grand analogy between Adam I and Adam II, between Eve and the bride of Christ.

Because we are members of his body ... Paul here says of the bride of Christ, what Adam said of his bride, "bone of my bones ... flesh of my flesh" (Genesis 2:23). Without the inspiration of one like Paul, people would probably never have known the magnificent analogy concealed in the creation story itself as a prophecy and prefiguration of the church. Paul had long understood the "mystery" mentioned here, having brought it to light by various earlier references to it. In 2Corinthians (2 Corinthians 11:3), he pointed out that Satan's seduction of the bride of the first Adam suggested the seduction by Satan of the bride of the second Adam (the church).

ADAM AND EVE ... CHRIST AND THE BRIDE

Adam naturally provides the great type of Christ. Just as Adam was progenitor of all living, so Christ is the author of life in himself. As in Adam all die, so in Christ shall all be made alive. When Eve was formed, a deep sleep fell upon Adam, and Eve was taken from his side. In the redemptive act on the cross, the deep sleep of death came upon Christ; his side was pierced; blood and water came forth, these emblems of the two great Christian ordinances of baptism and the Lord's supper, making it possible to see (in a figurative sense) that the church came forth from the side of Christ. Satan beguiled Eve, and likewise the church, luring her into the great apostasy. There are extensive analogies in this, one of them appearing particularly in these verses, that being the oneness of Adam with his bride forming a prophecy of the oneness of Christ and the church.