74 Then he began to call down curses, and he swore to them, “I don’t know the man!” Immediately a rooster crowed.

Read Matthew 26:74 Using Other Translations

Then began he to curse and to swear, saying, I know not the man. And immediately the cock crew.
Then he began to invoke a curse on himself and to swear, "I do not know the man." And immediately the rooster crowed.
Peter swore, “A curse on me if I’m lying—I don’t know the man!” And immediately the rooster crowed.