Catechism of the Catholic Church

602 Consequently, St. Peter can formulate the apostolic faith in the divine plan of salvation in this way: "You were ransomed from the futile ways inherited from your fathers... with the precious blood of Christ, like that of a lamb without blemish or spot. He was destined before the foundation of the world but was made manifest at the end of the times for your sake." ⁴⁰² Man's sins, following on original sin, are punishable by death. ⁴⁰³ By sending his own Son in the form of a slave, in the form of a fallen humanity, on account of sin, God "made him to be sin who knew no sin, so that in him we might become the righteousness of God." ⁴⁰⁴

603 Jesus did not experience reprobation as if he himself had sinned. ⁴⁰⁵ But in the redeeming love that always united him to the Father, he assumed us in the state of our waywardness of sin, to the point that he could say in our name from the cross: "My God, my God, why have you forsaken me?" ⁴⁰⁶ Having thus established him in solidarity with us sinners, God "did not spare his own Son but gave him up for us all", so that we might be "reconciled to God by the death of his Son". ⁴⁰⁷