Romans 4:9

Verse 9. Cometh, etc. The apostle has now prepared the way for an examination of the inquiry whether this came in consequence of obedience to the law? or whether it was without obedience to the law? Having shown that Abraham was justified by faith, in accordance with the doctrine which he was defending, the only remaining inquiry was, whether it was after he was circumcised or before; whether in consequence of his circumcision or not. If it was after his circumcision, the Jew might still maintain that it was by complying with the works of the law; but if it was before, the point of the apostle would be established, that it was without the works of the law.