Theophylact of Ohrid
Catena Aurea · Lukasevangelium 22
And the Lord said, Simon, Simon, behold, Satan hath desired to have you, that he may sift you as wheat: But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren. And he said unto him, Lord, I am ready to go with thee, both into prison, and to death. And he said, I tell thee, Peter, the cock shall not crow this day, before that thou shalt thrice deny that thou knowest me.
He burns forth indeed with too much love, and promises what is impossible to him. But it behoved him as soon as he heard from the Truth that he was to be tempted, to be no longer confident. Now the Lord, seeing that Peter spoke boastfully, reveals the nature of his temptation, namely, that he would deny Him; I tell thee, Peter, the cock shall not crow this day, before that thou thrice deny, &c.