John Gill Commentary Luke 22:34

"And he said, I tell thee, Peter, the cock shall not crow this day, until thou shalt thrice deny that thou knowest me." — Luke 22:34 (ASV)

And he said
"To him", as all the Oriental versions add; to Peter, as what is said shows; that is, Jesus said to him, as the Syriac and Persic versions express:

I tell you ,
Peter; who knew him, and his heart, better than he did himself, as well as knew what was to come, and what would befall him; and therefore declares it, as he does with the greatest assurance and certainty, and which might be depended on, and accordingly came to pass:

the cock shall not crow this day ;
in this night, as in (Mark 14:30) or this night, as in (Matthew 26:34) for it was now night; a natural day includes both night and day; a like way of speaking, see in (Luke 2:8Luke 2:11)

before that you shall thrice deny that you know me ;
as he did, (Luke 22:57Luke 22:58Luke 22:60) . (See Gill on Matthew 26:34).