Galatians 2:5 - Matthew Poole's English Annotations on the Holy Bible

To these Judaizing Christians the apostle did not think fit to yield one jot, not for the least time, nor in so much as one precedent; having a desire that these Gentile churches might not be perverted. Or, (as others think), to which men of reputation we yielded not in the least. It is very probable, that Peter and James, upon their first arguing the case, to avoid the scandal and offence of the Jews, would have had Titus circumcised: St. Paul would not yield to it, that he might preserve the doctrine of the gospel, which he had planted amongst the Galatians, and other Gentiles, pure, and not encumber those churches with the Mosaical rites. But the most and best interpreters rather judge the persons here mentioned, to whom Paul would not yield, to be some Judaizing Christians, rather than the persons of reputation, mentioned Galatians 2:2.