For he has made him, who knew no sin, to be sin for us; that we might be made the righteousness of God in him.
All Commentaries on 2 Corinthians 5:21 Go To 2 Corinthians 5
Ambrosiaster
AD 400
Christ did not have to be born as a man, but he became man because of sin. It was only because all flesh was subject to sin that he was made sin for us. In view of the fact that he was made an offering for sins, it is not wrong for him to be said to have been made “sin,” because in the law the sacrifice which was offered for sins used to be called a “sin.” After his death on the cross Christ descended to hell, because it was death, working through sin, which gave hell its power. Christ defeated death by his death and brought such benefit to sinners that now death cannot hold those who are marked with the sign of the cross. Commentary on Paul’s Epistles.