John Chrysostom
Since they slandered him by saying that he often observed Jewish rites and preached uncircumcision hypocritically, see how he showed himself clean from this slander. He calls them themselves as witnesses.
"You yourselves know," he says, "that the cause of the persecutions against me was that I command men to leave the Law. If I preached circumcision, why would they persecute me?"
"The Judaizers can accuse me of nothing else. If I allowed them to believe according to the ancestral customs, neither believers nor unbelievers would plot against me. Nothing of their customs would be rejected."
What then? Did he not preach circumcision? Did he not circumcise Timothy (Acts 16)? Certainly he circumcised him. How then does he say, "I do not preach it"?
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Notice his caution here also. He did not say, "I do not perform circumcision," but, "I do not preach it." That is, "I do not teach men to believe in this way."
"You must not take my action as the confirmation of dogmas. I did indeed circumcise, but I did not preach circumcision."
"Then the stumbling block of the Cross has ceased." This means: "If what you say is true, then the barrier and hostility that divide us have been destroyed."
The Jews were offended not so much by the Cross as by the teaching that they should not follow the ancestral customs. When they brought Stephen before the council, they did not say that he honored the Crucified One.
Rather, they said that he spoke blasphemous words against this place and the holy Law (Acts 6:13). They accused Jesus Himself of destroying the Law (Jn 5:16).
Therefore Paul says: "If we allow circumcision, then your struggle against us has ceased. There is no longer any hostility against the Cross and the preaching. But if we are put to death daily, why are we accused of this?"
"Hands were laid on me precisely because I brought an uncircumcised man into the temple. Am I then so senseless," he says, "that, while allowing circumcision, I would decide to suffer such evil entirely in vain?"
"Would I also give such an offense to the Cross? You yourselves see that they are hostile to us for nothing so much as for circumcision. Was I then so senseless as to subject myself to affliction without any cause, and lead others into offense?"
He called this the stumbling block of the Cross because the teaching of the Cross also commands the abandonment of the ancestral customs. This command especially offended the Jews and served as an obstacle to receiving the Cross.