Three important truths emerge from this passage. Uncircumcised believing Abraham is thereby the father of uncircumcised believing Gentiles. Believing Abraham, circumcised after justification, is thereby the father of believing Jews, circumcised before justification. Abraham was circumcised as a sign and seal of the righteousness he had by faith. That righteousness was not his own personal faith, it was Christ. Circumcision was his seal that Christ, his righteousness, would in fact come. So when Abraham took this seal in his body, he was thus marked as the father of all believers in Christ—Jew
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