Certainly that weakness and mortality (which were not sin but the punishment for sin) were accepted by the world's Redeemer as a penalty, in order that he might pay the price. As a result, that which used to be the transmission of condemnation onto all human beings becomes in Christ a 'mystery of compassion.' He offered himself (though free of debt) to his cruel taskmaster, allowing the violence of Jews (as servants of the devil) to crucify his sinless flesh.
id., Sermon 72
Fifth Century