Galatians 3:7

They which are of faith. That is, those who rely on faith in the saving merits of Christ, without “the works of the law” (see on ch. 2:16).

Children of Abraham. That is, his spiritual — not necessarily physical — descendants (see vs. 26-29). All who have the same unwavering faith that Abraham had are considered his spiritual heirs. They attain to righteousness as he did and are eligible to receive all the blessings promised him. In Rom. 4:10, 11 Paul stresses the fact that God imputed righteousness to Abraham before he was circumcised — the first so-called “work” of the law performed for every Jew and for every convert to Judaism. If Abraham could find justification apart from the works of the law, certainly Gentiles can do the same.

This is the heart of Paul’s argument against the Judaizers, who were insisting on circumcision as a necessary prerequisite to justification. Paul argues that there is no difference between the way in which a Jew and a Gentile find favor with God; all are saved, if they find salvation at all, by faith (Rom. 3:22; 10:12). No Jew or Gentile was ever saved by “works.” The only way that any man can be saved is through faith in Jesus Christ (Acts 4:12).