Matthew 26:73

After a little while, those who stood by came and said to Peter: Of a truth you also are one of them, for your speech betrays you.

Luke 22:59-60

And about one hour after, another confidently affirmed, saying: Of a truth, this man also was with him; for he is a Galilean.

John 18:26-27

One of the servants of the chief priest, who was a kinsman of him 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
And about one hour after, another confidently affirmed, saying: Of a truth, this man also was with him; for he is a Galilean.
John 18:26
One of the servants of the chief priest, who was a kinsman of him whose ear Peter had cut off, said: Did I not see you in the garden with him?