The third challenge came from the bystanders, several people instead of just one, about an hour later ( Luke 22:59). This time Peter went further. He denied that he even knew Jesus (cf. Mark 8:29). He even called down God"s judgment on himself if he was lying. Cursing means he put himself under a curse. Swearing means he affirmed the truthfulness of his words with oaths. [source][source][source]