Origen — as excerpted in the Catena Aurea on Mark 8:27-33

“(in Matt. Tom. xii. 15) Or else, Mark and Luke, as they wrote that Peter answered, Thou art the Christ, without adding what is put down in Matthew, the Son of the living God, so they omitted to relate the blessing which was conferred on this confession. It goes on, And he charged them that they should tell no man of him.”