Galatians 2:11-12

11 But when Cephas came to Antioch, I opposed him to his face, because he stood self-condemned;
12 for until certain people came from James, he used to eat with the Gentiles. But after they came, he drew back and kept himself separate for fear of the circumcision faction.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.