John Chrysostom
Have you noticed how he proved that the Jews were rather in the position of uninvited guests, των παρασίτων, than those who remained in uncircumcision and were afterward admitted to fellowship with the Jews? For if Abraham was justified and crowned while uncircumcised, and only afterward received circumcision, and if the Jews entered later, then Abraham is first of all the father of the uncircumcised, who are kin to him through faith. Only afterward is he father of the circumcised. He is a twofold forefather.
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Do you see that faith shone forth? Until faith was present, the patriarch was not justified. Do you see that uncircumcision was no obstacle at all? Abraham was uncircumcised, and this did not prevent him from being justified. Therefore circumcision appeared later than faith. And why are you amazed that circumcision appeared later than faith, since it is later even than uncircumcision?
It is not only later than faith, but far more imperfect than faith. It is so in the same measure as a sign is paler than the thing itself. It is like the image of a soldier, which is inferior to the soldier himself.
Why, you ask, did Abraham need such a sign or seal? He himself did not need it. Why then did he receive it? So that he might become the common father of believers in uncircumcision and in circumcision, not merely of the circumcised. Therefore the Apostle adds: Rom 4:12, “not to those only who are of the circumcision.”