Bede the Venerable — as excerpted in the Catena Aurea on Mark 14:66-72

“(ubi sup.) By this denial of Peter we learn, that not only he denies Christ, who says that He is not the Christ, but he also, who although he is a Christian, denies himself to be such. For the Lord did not say to Peter, Thou shalt deny thyself to be my disciple, but, Thou shalt deny me; he therefore denied Christ, when he said that he was not His disciple. There follows: And a little after, they that stood by said again to Peter, Surely thou art one of them, for thou art a Galilæan, and thy speech agreeth thereto. Not that the Galilæans spoke a different tongue from the inhabitants of Jerusalem, for they were both Hebrews, but that each province and region has its own peculiarities, and cannot avoid a vernacular pronunciation.”