Charles Spurgeon Commentary Romans 4:9-10

"Is this blessing then pronounced upon the circumcision, or upon the uncircumcision also? for we say, To Abraham his faith was reckoned for righteousness. How then was it reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision:" — Romans 4:9-10 (ASV)

For we say that faith was reckoned to Abraham for righteousness.

How was it then reckoned? When he was in circumcision, or in uncircumcision? Look back to the history. See in what condition Abraham was when faith was reckoned to him for righteousness.

Was it when he was in circumcision or in uncircumcision? The answer is:—

For we say that faith was reckoned to Abraham for righteousness. How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.

If you turn again to Genesis 15:6, and then to Genesis 17:10, you will find that Abraham was justified by faith before the rite of circumcision was instituted. The blessing came to him not in circumcision, but in uncircumcision.