Tertullian, on Gal 2:12

“For before that some came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them who were of the circumcision.”

“Paul, however, censures Peter for not walking straightforwardly according to the truth of the gospel. No doubt he blames him; but it was solely because of his inconsistency in the matter of "eating," which he varied according to the sort of persons (whom he associated with) "fearing them which were of the circumcision," but not on account of any perverse opinion touching another god.”

Imported from an open dataset — not yet checked against the printed edition.