Matthew 26:73

A few minutes afterward the bystanders came up to Peter and said, "You are surely one of them, too, for your accent gives you away."

Luke 22:59-60

About an hour later another man emphatically asserted, "He certainly was with Him, for he is a Galilean!"

John 18:26-27

One of the high priest's slaves, who was a kinsman of the one whose ear Peter had cut off, said, "Did I not see you in the garden with Him?"

Treasury of Scripture Knowledge

Summary

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.

Bible References

Surely

Luke 22:59
About an hour later another man emphatically asserted, "He certainly was with Him, for he is a Galilean!"
John 18:26
One of the high priest's slaves, who was a kinsman of the one whose ear Peter had cut off, said, "Did I not see you in the garden with Him?"