Galatians 5:11

Translate, "If I am still preaching (as I did before conversion) circumcision, why am I still persecuted?" The Judaizing troubler of the Galatians had said, "Paul himself preaches circumcision," as is shown by his having circumcised Timothy (Act 16:3; compare also Act 20:6; Act 21:24). Paul replies by anticipation of their objection, As regards myself, the fact that I am still persecuted by the Jews shows plainly that I do not preach circumcision; for it is just because I preach Christ crucified, and not the Mosaic law, as the sole ground of justification, that they persecute me. If for conciliation he lived as a Jew among the Jews, it was in accordance with his principle enunciated (Co1 7:18, Co1 7:20; Co1 9:20). Circumcision, or uncircumcision, are things indifferent in themselves: their lawfulness or unlawfulness depends on the animus of him who uses them. The Gentile Galatians' animus in circumcision could only be their supposition that it influenced favorably their standing before God. Paul's living as a Gentile among Gentiles, plainly showed that, if he lived as a Jew among Jews, it was not that he thought it meritorious before God, but as a matter indifferent, wherein he might lawfully conform as a Jew by birth to those with whom he was, in order to put no needless stumbling-block to the Gospel in the way of his countrymen.

— Jamieson-Fausset-Brown Commentary (public domain)