Gospel of Barnabas
Paul was attacking Peter for "trying to satisfy the Jews" by sticking to their laws, such as circumcision. It is contended that at this point Barnabas was following Peter and disagreeing with Paul. Some feel it also suggests that the inhabitants of Galatia at his time were using a gospel or gospels disagreeing with Paul's beliefs, which the Gospel of Barnabas could be one of them (although the Gospel of Peter would seem a more natural candidate, as in the light of the second letter.) To Galatian's account we may compare the Introductory Chapter of Gospel of Barnabas, where we read: