Mark 14:70
And he denied it again. And a little after, they that stood by said again to Peter, Surely thou art one of them: for thou art a Galilean, and thy speech agreeth thereto.
Cross-references
Matthew 26:73 records the same third denial with bystanders noting Peter's Galilean accent—direct parallel to this moment.
Matthew 26:74 shows Peter's cursing and oath in response to the accusation—the same reaction as in Mark's account but with more detail.
Luke 22:59 records the same third denial, with the accuser noting Peter's Galilean identity—parallel account of this event.
Luke 22:60 records the same third denial with Peter swearing and the rooster crowing — a parallel account of this event.
John 18:27 records the denial and rooster crow, completing the parallel account of Peter's third denial.
Luke 22:58 records the second denial where another bystander identifies Peter as one of Jesus' followers.
John 18:26 specifies the accuser as a relative of Malchus, linking Peter's denial to his earlier violence in the garden.