Irenaeus on Christ as the second Adam

"After the flesh [Christ] might be the son of David, who was the son of Abraham by a long succession; but according to the spirit Son of God, pre-existing with the Father, begotten before all the creation of the world, and at the end of the times appearing to all the world as man, the Word of God gathering up in Himself all things that are in heaven and that are on earth.So then He united man with God, and established a community of union between God and man; since we could not in any other way participate in incorruption, save by His coming among us. For so long as incorruption was invisible and unrevealed, it helped us not at all: therefore it became visible,that in all respects we might participate in the reception of incorruption. And, because in the original formation of Adam all of us were tied and bound up with death through his disobedience, it was right that through the obedience of Him who was made man for us we should be released from death: and because death reigned over the flesh, it was right that through the flesh it should lose its force and let man go free from its oppression. So the Word was made flesh,that, through that very flesh which sin had ruled and dominated, it should lose its force and be no longer in us. And therefore our Lord took that same original formation as (His) entry into flesh, so that He might draw near and contend on behalf of the fathers, and conquer by Adam that which by Adam had stricken us down."

Irenaeus, Proof of the Apostolic Preaching Ch. 30