John Chrysostom
Egypt and Idumea. Beginning - v. 25 Despite their physical signs of circumcision, they remain spiritually uncircumcised, as their actions do not align with the divine law; hence, the Idumeans and others are deemed as circumcised in a wider sense. The heart's condition is far more significant than physical circumcision, revealing a deeper uncircumcision. Some assert that the Egyptians practiced circumcision, as noted by Herodotus. I consider the Saracens as part of this discussion. What do you believe? They, too, are not circumcised in this regard. Even less are you circumcised in spirit. Yet you may wonder about the Jews; just as the others did not gain anything from their physical circumcision, so too are you in a worse situation.
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When it is stated, "And upon every one that trims the hair of his face," it refers to the Saracens, who maintain length at the back of the head while cutting the hair above the forehead, embellishing their appearance; they are now labeled gentilii (γεντίλιοι). In asserting that they are uncircumcised in spirit compared to all nations and demonstrating that this is not a mere indictment, he further elaborates: (ch. 10).