"It was “certain of the sect of the Pharisees, which believed” who had caused all the trouble in the churches in Galatia, and called forth a letter to the Galatians. It was these also who had troubled the brethren at Antioch, and raised there the controversy abroad on the council Jerusalem. It was these who, even after the council, had caused Peter to swerve, at Antioch, from the truth of the Gospel, which, in turn, forced Paul to withstand him to the face. It was these of the sect of the Pharisees who spread a false gospel against the true, and subverted souls who were even already saved—as at Antioch and in Galatia."  Alonzo T. Jones