How - In what circumstances, or time.
When he was in circumcision - Before or after he was circumcised? This was the very point of the inquiry. For if he was justified by faith after he was circumcised, the Jew might pretend that it was in virtue of his circumcision; that even his faith was acceptable, because he was circumcised. But if it was before he was circumcised, this plea could not be set up; and the argument of the apostle was confirmed by the case of Abraham, the great father and model of the Jewish people, that circumcision and the deeds of the Law did not conduce to justification; and that as Abraham was justified without those works, so might others be, and the pagan, therefore, might be admitted to similar privileges.
Not in circumcision - Not being circumcised, or after he was circumcised, but before. This was the record in the case; Genesis 15:6; Compare Genesis 17:10.

How was it then reckoned? - In what circumstances was Abraham when this blessing was bestowed upon him? When he was circumcised, or before?
Not in circumcision, but in uncircumcision - Faith was reckoned to Abraham for justification, as we read Genesis 15:6, (see the note on Genesis 15:6); but circumcision was not instituted till about fourteen or fifteen years after, Genesis 17:1, etc.; for faith was reckoned to Abraham for righteousness or justification at least one year before Ishmael was born; compare Genesis 15, and 16. At Ishmael's birth he was eighty-six years of age, Genesis 16:16; and, at the institution of circumcision, Ishmael was thirteen, and Abraham ninety-nine years old. See Genesis 17:24, Genesis 17:25; and see Dr. Taylor.

(7) How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.
(7) He proves that it belongs to the uncircumcised (for there was no doubt of the circumcised) in this way: Abraham was justified in uncircumcision, therefore this justification belongs also to the uncircumcised. Nay, it does not belong to the circumcised, in respect of the circumcision, much less are the uncircumcised shut out from it because of their uncircumcision.

How was it then reckoned?.... The Arabic version adds, "and when"; and the Ethiopic version reads it, "when was Abraham justified?" expressing the sense, not the words of the original text, with which agree the following questions:
when he was in circumcision, or in uncircumcision? that is, was he justified, or his faith reckoned to him for righteousness, when he was a circumcised, or an uncircumcised person?
not in circumcision; or when he was circumcised; for when it was said of him, that "he believed in the Lord", and "he counted it to him for righteousness", Genesis 15:6, he was then uncircumcised, and remained so many years after: for this was before the birth of Ishmael, and Ishmael was "thirteen" years of age when he and his father Abraham were circumcised; so that it must be "fourteen" years, or thereabout, before his circumcision, that this declaration of his being a justified person was made; wherefore the apostle rightly adds,
but in uncircumcision; or whilst an uncircumcised person: hence it clearly appears that circumcision could not be the cause of his justification, since it followed it; and if Abraham when uncircumcised was a justified person, as it is certain he was, why may not uncircumcised Gentiles be justified also? and especially when it is observed, that the covenant made with Abraham when uncircumcised, included the Gentiles; see Genesis 12:3.

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.