Matthew 26:72 in the King James Version
And again he denied with an oath, I do not know the man.
Context
71 When he had gone out onto the porch, someone else saw him and said to those who were there, “This man also was with Jesus of Nazareth.”
72 Again he denied it with an oath, “I don’t know the man.”
73 After a little while those who stood by came and said to Peter, “Surely you are also one of them, for your speech makes you known.”