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
John Chrysostom
AD 407
God allowed his Son to suffer as if a condemned sinner, so that we might be delivered from the penalty of our sins. This is God’s righteousness, that we are not justified by works (for then they would have to be perfect, which is impossible), but by grace, in which case all our sin is removed.