Matthew 26:72 Meaning

70But he denied before them all, saying, I know not what thou sayest.

71And when he was gone out into the porch, another maid saw him, and said unto them that were there, This fellow was also with Jesus of Nazareth.

72And again he denied with an oath, I do not know the man.

73And 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.

74Then began he to curse and to swear, saying, I know not the man. And immediately the cock crew.