Matthew 26:73

A little later the bystanders came up and said to Peter, “Surely you too are one of them; for even the way you talk gives you away.”

Judges 12:6

then they would say to him, “Say now, ‘Shibboleth.’” But he said, “Sibboleth,” for he could not pronounce it correctly. Then they seized him and slew him at the fords of the Jordan. Thus there fell at that time 42,000 of Ephraim.

Nehemiah 13:24

As for their children, half spoke in the language of Ashdod, and none of them was able to speak the language of Judah, but the language of his own people.

Luke 22:59-60

After about an hour had passed, another man began to insist, saying, “Certainly this man also was with Him, for he is a Galilean too.”

John 18:26-27

One of the slaves of the high priest, being a relative of the one whose ear Peter 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.

General references

Bible References

Surely

Luke 22:59
After about an hour had passed, another man began to insist, saying, “Certainly this man also was with Him, for he is a Galilean too.”
John 18:26
One of the slaves of the high priest, being a relative of the one whose ear Peter cut off, *said, “Did I not see you in the garden with Him?”

For

Judges 12:6
then they would say to him, “Say now, ‘Shibboleth.’” But he said, “Sibboleth,” for he could not pronounce it correctly. Then they seized him and slew him at the fords of the Jordan. Thus there fell at that time 42,000 of Ephraim.
Nehemiah 13:24
As for their children, half spoke in the language of Ashdod, and none of them was able to speak the language of Judah, but the language of his own people.

General references

Proverbs 25:26
Like a trampled spring and a polluted well
Is a righteous man who gives way before the wicked.