He divided the Jordan and made the people to pass over into the land;
and, when he had overthrown and destroyed the seven races that dwelt therein, he assigned to the people the temporal Jerusalem, wherein David was king, and Solomon his son, who built the temple to the name of God, according to the likeness of the tabernacle which had been made by Moses after the pattern of the heavenly and spiritual things.
Hither were the prophets sent by God through the Holy Spirit; and they instructed the people and turned them to the God of their fathers, the Almighty;
and they became heralds of the revelation of our Lord Jesus Christ the Son of God, declaring that from the posterity of David His flesh should blossom forth;
that after the flesh He 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 (Eph. 1:10).
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 (cf 2 Tim. 1:10), 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 (John 1:14), 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 of Lyons (2nd century AD – c. 202): Demonstration of the Apostolic Preaching, 29-31.