4:9. This blessedness then, doth it remain in the circumcision only or in the uncircumcision also? For we say that unto Abraham faith was reputed to justice.
In the circumcision, etc… That is, is it only for the Jews that are circumcised? No, says the apostle, but also for the uncircumcised Gentiles: who, by faith and grace, may come to justice; as Abraham did before he was circumcised.
4:10. How then was it reputed? When he was in circumcision or in uncircumcision? Not in circumcision, but in uncircumcision.
4:11. And he received the sign of circumcision, a seal of the justice of the faith which he had, being uncircumcised: that he might be the father of all them that believe, being uncircumcised: that unto them also it may be reputed to justice:
4:12. And he might be the father of circumcision; not to them only that are of the circumcision, but to them also that follow the steps of the faith that is in the uncircumcision of our father Abraham.
4:13. For not through the law was the promise to Abraham or to his seed, that he should be heir of the world: but through the justice of faith.
4:14. For if they who are of the law be heirs, faith is made void: the promise is made of no effect.
Be heirs… That is, if they alone, who follow the ceremonies of thelaw, be heirs of the blessings promised to Abraham; then that faith which was so much praised in him, will be found to be of little value. And the very promise will be made void, by which he was promised to be the father, not of the Jews only, but of all nations of believers.
4:15. For the law worketh wrath. For where there is no law, neither is there transgression.
The law worketh wrath… The law, abstracting from faith and grace, worketh wrath occasionally, by being an occasion of many transgressions, which provoke God's wrath.