3:30 Seeing [it is] one God, which shall justify {g} the circumcision by faith, and uncircumcision through faith.
(g) The circumcised.
3:30 Seeing [it is] one God which shall justify. As there is one God, there is one plan of justification.
The circumcision, the Jews are justified
by faith, a faith not in God, whom they already acknowledged, but a faith in Christ, God manifest in the flesh. In the same way the
uncircumcision, the Gentile world, are justified
through faith. The Gospel is meant by the faith (the article is found in the Greek). The salvation of both is by faith in Christ crucified.
3:30 Seeing it is one God who - Shows mercy to both, and by the very same means.
3:27-31 God will have the great work of the justification and salvation of sinners carried on from first to last, so as to shut out boasting. Now, if we were saved by our own works, boasting would not be excluded. But the way of justification by faith for ever shuts out boasting. Yet believers are not left to be lawless; faith is a law, it is a working grace, wherever it is in truth. By faith, not in this matter an act of obedience, or a good work, but forming the relation between Christ and the sinner, which renders it proper that the believer should be pardoned and justified for the sake of the Saviour, and that the unbeliever who is not thus united or related to him, should remain under condemnation. The law is still of use to convince us of what is past, and to direct us for the future. Though we cannot be saved by it as a covenant, yet we own and submit to it, as a rule in the hand of the Mediator.