Matthew 26:73

And after a while they that stood by, came and said to Peter, Surely thou art also one of them; for thy speech discovereth thee.

Luke 22:59-60

And Peter said, Man, I am not. And about one hour after, another confidently affirmed, saying, Of a truth this fellow also was with him, for he is a Galilean.

John 18:26-27

One of the servants of the high priest (being kinsman to him whose ear Peter had 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 Peter said, Man, I am not. And about one hour after, another confidently affirmed, saying, Of a truth this fellow also was with him, for he is a Galilean.
John 18:26
One of the servants of the high priest (being kinsman to him whose ear Peter had cut off) saith, Did not I see thee in the garden with him?