Matthew 26:73

A little while after the bystanders came up to Peter and said, "You are certainly one of them too, for your accent shows it!"

Luke 22:59-60

About an hour later, another man insisted, "This man was certainly with him too, for he is a Galilean!"

John 18:26-27

One of the high priest's slaves, a relative of the man whose ear Peter had cut off, said, "Did I not see you with him in the garden?"

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 insisted, "This man was certainly with him too, for he is a Galilean!"
John 18:26
One of the high priest's slaves, a relative of the man whose ear Peter had cut off, said, "Did I not see you with him in the garden?"