Matthew 26:73
And after a while came unto him they that stood by, and said to Peter, Surely thou also art one of them; for thy speech bewrayeth thee.
Cross-references
In Nehemiah 13:24, children of mixed marriages spoke foreign languages instead of Judah's—both passages highlight how speech reveals a person's origins or identity.
Luke 22:59 adds that 'about an hour later' another person accused Peter of being a Galilean.
Luke 22:60 records Peter's third denial and the rooster crowing, directly parallel to the lead-up in Matthew.
John 18:26 specifies the accuser was a relative of Malchus, adding detail to the Galilean accent accusation.
John 18:27 records Peter's third denial and the rooster crowing, a direct parallel.
Mark 14:70 gives the same scene: bystanders identify Peter as a Galilean by his accent, directly parallel to this account.
Judges 12:6 uses accent to identify Ephraimites — similar to how Peter's Galilean accent gave him away.
In Judges 18:3, the Danites recognize a Levite by his voice—similar to how Peter's Galilean accent gives him away here.