Irenaeus
"Consequently, then, Mary the Virgin is found to be obedient, saying, ‘Behold, O Lord, your handmaid; be it done to me according to your word.’ Eve, however, was disobedient, and, when yet a virgin, she did not obey. Just as she, who was then still a virgin although she had Adam for a husband—for in paradise they were both naked but were not ashamed; for, having been created only a short time, they had no understanding of the procreation of children, and it was necessary that they first come to maturity before beginning to multiply—having become disobedient, was made the cause of death for herself and for the whole human race; so also Mary, betrothed to a man but nevertheless still a virgin, being obedient, was made the cause of salvation for herself and for the whole human race. . . . Thus, the knot of Eve’s disobedience was loosed by the obedience of Mary. What the virgin Eve had bound in unbelief, the Virgin Mary loosed through faith" (Against Heresies 3:22:24 [A.D. 189]).
"The Lord then was manifestly coming to his own things, and was sustaining them by means of that creation that is supported by himself. He was making a recapitulation of that disobedience that had occurred in connection with a tree, through the obedience that was upon a tree [i.e., the cross]. Furthermore, the original deception was to be done away with—the deception by which that virgin Eve (who was already espoused to a man) was unhappily misled. That this was to be overturned was happily announced through means of the truth by the angel to the Virgin Mary (who was also [espoused] to a man). . . . So if Eve disobeyed God, yet Mary was persuaded to be obedient to God. In this way, the Virgin Mary might become the advocate of the virgin Eve. And thus, as the human race fell into bondage to death by means of a virgin, so it is rescued by a virgin. Virginal disobedience has been balanced in the opposite scale by virginal obedience. For in the same way, the sin of the first created man received amendment by the correction of the First-Begotten" (ibid., 5:19:1 [A.D. 189]).