Expositor's Bible Commentary Commentary Galatians 3:7

"Know therefore that they that are of faith, the same are sons of Abraham." — Galatians 3:7 (ASV)

One example does not make a case, however. So Paul continues his argument with a sentence linking the situation of Abraham to the present. He means, “Since Abraham was saved by faith, his true children are, therefore, even now, those who are saved by faith, as he was.” The background is undoubtedly the claim of the Judaizers that one became a genuine child of Abraham by circumcision and subsequent obedience to the law. This verse is an important one for linking the two covenants, that of the OT and that of the NT, for Paul stresses that Abraham’s faith was of the same kind as Christian faith.