This speech, The cock shall not crow, occurs in all the Evangelists, but not at the same time in all. Matthew and Mark introduce it after they have left the house, in which they were eating; Luke and John before. We may suppose either that the two former are recurring to what had passed, or the two latter anticipating what is coming. Or the great difference not only of the words, but of the subjects which precede the speech, and which excite Peter to the presumption of offering to die, for or with our Lord, may lead us to conclude that he made this offer three times, and that our Lord three times replied, Before the cock crow, thou shalt deny Me thrice.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Con. Evang. iii. c. 2. [5.]