Matthew 26:73

A few moments later, those who were near approached and said to Peter: Indeed, you are one of them, because the way you speak gives you away.

Judges 12:6

they would tell him to say Shibboleth. But he would say Sibboleth, because he could not pronounce it correctly. Then they would kill him at the Jordan River crossing. Forty-two thousand of the Ephraimites were killed.

Nehemiah 13:24

Their children were talking half in the language of Ashdod; they had no knowledge of the Jews' language, but made use of the language of the two peoples.

Luke 22:59-60

Another hour passed. Someone else said: It is true this man was with him for he is a Galilean.

John 18:26-27

One of the servants of the high priest, being a relative of him whose ear Peter cut off, said: Did I 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.

General references

Bible References

Surely

Luke 22:59
Another hour passed. Someone else said: It is true this man was with him for he is a Galilean.
John 18:26
One of the servants of the high priest, being a relative of him whose ear Peter cut off, said: Did I see you in the garden with him?

For

Judges 12:6
they would tell him to say Shibboleth. But he would say Sibboleth, because he could not pronounce it correctly. Then they would kill him at the Jordan River crossing. Forty-two thousand of the Ephraimites were killed.
Nehemiah 13:24
Their children were talking half in the language of Ashdod; they had no knowledge of the Jews' language, but made use of the language of the two peoples.

General references

Proverbs 25:26
A righteous man falling down before the wicked is as a troubled fountain, and a corrupt spring.