The law and the prophets then are witnesses of the righteousness of God; this righteousness is disclosed through faith in Jesus Christ to all who believe, among whom there is no distinction whether they believe as Jews or as Gentiles. Notice, however, that he does not put down to faith alone the single cause of the disclosure of the righteousness of God, but he associates with it both the law and the prophets. The reason for this is that faith alone, apart from the law and the prophets, does not disclose the righteousness of God nor, on the other hand, do the law and the prophets disclose it apart from faith. Thus the one is rooted in the other so that perfection comes from both.
He says there is no distinction between Jews and Greeks since it is certain that all equally have come under sin, as became clear above. And he says that now the righteousness of God, which is supported by testimonies in the law and the prophets, has also been given equally to all through faith in Jesus Christ. But because all had come under sin, doubtless they were likewise estranged from the glory of God because they were able neither to receive it in any respect whatsoever nor to merit it. For how would a sinner dare to give glory to God, to whom the prophet says, “But God has said to the sinner: Why do you recite my righteous requirements?” And again another Scripture says, “Praise is unseemly in the mouth of a sinner.” Therefore the righteousness of God through faith in Jesus Christ reaches to all who believe, whether they are Jews or Greeks. It justifies those who have been cleansed from their past crimes and makes them capable of receiving the glory of God; and it supplies this glory not for the sake of their merits nor for the sake of works, but freely to those who believe.
Origen, Commentary on Romans 3.7.12–13