Galatians 2:11

But when Peter was come to Antioch. It is not certainly known when this event occurred, but probably not far from A.D. 51. Paul narrates it to show that Peter had no superiority over him, as the Judaizers claimed, and as the Romanists still assert.

I withstood him to the face, because he was to be blamed. Peter did a wrong thing, and Paul rebuked him for it.
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