Romans 3:30

Seeing it is one God. Textual evidence favors (cf. p. 10) the reading “if so be that God is one.” Paul knows that his statement of the oneness of God is as certain to his readers as it is to himself, but he puts it into this form in order to make more effective the logic of his argument. The most fundamental of all Jewish beliefs was that Jehovah is God alone and the God of all the kingdoms of the earth (Deut. 6:4; 2 Kings 19:15; Isa. 44:6; 1 Cor. 8:4-6; 1 Tim. 2:4-6). He “made of one blood all nations of men” (Acts 17:26), and in Him we all “live, and move, and have our being” (v. 28). This same and only God offers justification to all men everywhere without “respect of persons” on the basis of faith.

The circumcision. That is, the circumcised, the Jews (see Gal. 2:9).

Through faith. Literally, “through the faith,” that is, the faith referred to earlier in the verse. It is not certain that importance should be attached to the difference in the wording of this and the phrase “by faith.” Some have regarded them as essentially the same in meaning. The emphasis is on faith. Faith, not circumcision, will bring justification to the Jew. Likewise the Gentile, even though he is not circumcised, will be justified by the same faith that is required of the Jew.