Charles Spurgeon Commentary Mark 14:67

"and seeing Peter warming himself, she looked upon him, and saith, Thou also wast with the Nazarene, [even] Jesus." — Mark 14:67 (ASV)

68.

And said, And thou also wast with Jesus of Nazareth. But he denied, saying, I know not, neither understand I what thou sayest.

And he went out into the porch; and the cock crew.

This first time was not the regular season of cock-crowing, but those birds crow when they please. Before the fixed period called the cock-crowing, Peter was to deny his Master three times; this was the first time.