Romans 4:10

Overview - Romans 4
Abraham's faith was imputed to him for righteousness;
10 before he was circumcised.
13 By faith only he and his seed received the promise.
16 Abraham is the father of all that believe.
24 Our faith also shall be imputed to us for righteousness.
Treasury of Scripture Knowledge

Romans 4:10  (King James Version)
How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.

not in circumcision
"Faith was reckoned to Abraham for righteousness," at least 14 years before he was circumcised; the former having taken place some time before Ishmael's birth, at which time he was 86 years old, and the other when Ishmael was 13 years of age, and Abraham 99.
Genesis 15:5 Genesis 15:6 Genesis 15:16 ; 16:1-3 Genesis 17:1 Genesis 17:10 Genesis 17:23-27 1 Corinthians 7:18 1 Corinthians 7:19 ; Galatians 5:6 ; 6:15