Matthew 26:73

And shortly after, they who were standing by came and said to Peter, Surely thou too art one of them; for thy speech betrayeth thee.

Luke 22:59-60

And in about one hours time, another confidently affirmed, saying, In truth this man also was with him; for he is a Galilaean.

John 18:26-27

One of the servants of the highpriest, being a kinsman of him whose ear Peter cut off, saith, Did not I see thee 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 in about one hours time, another confidently affirmed, saying, In truth this man also was with him; for he is a Galilaean.
John 18:26
One of the servants of the highpriest, being a kinsman of him whose ear Peter cut off, saith, Did not I see thee in the garden with him?