Then we find Mark with Peter in Babylon between the years 62 and 64 C.E. (1 Pet. 5:13)

According to the earliest tradition of Papias, Origen, and Tertullian, this source was Peter, with whom Mark was closely associated.a Did not Peter call him “my son”? (1 Pet. 5:13) Peter was an eyewitness of practically all that Mark recorded, so he could have learned from Peter many descriptive points that are lacking in the other Gospels.