Not in circumcision — Not after he was circumcised; for he was justified before Ishmael was born, Genesis 15:1-21; but he was not circumcised till Ishmael was thirteen years old, Genesis 17:25.
Related Commentaries of Romans 4:10
Romans 4:10
10 How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.