John 18:27

“Peter then denied again, etc.] A third time, as the Ethiopic version renders it; and that, according to other evangelists, with cursing and swearing; for now he was more affrighted than before, lest should he be taken up, and it be proved upon him, that he was the person that cut off Malchus’s ear, he should be sentenced to a fine, or it may be some capital punishment. The fine for plucking a man’s ears, and which some understand of plucking them off, was four hundred “zuzim” f672, or, pence; which, as they answer to Roman pence, amount to twelve pounds ten shillings; a sum of money Peter perhaps could not have raised, without great difficulty: and therefore, that it might be believed he was…”

“Peter then denied again--But, if the challenge of Malchus' kinsman was made simultaneously with this on account of his Galilean dialect, it was no simple denial; for Mat 26:74 says, "Then began he to curse and to swear, saying, I know not the man." So Mar 14:71. This was THE THIRD DENIAL. and immediately--"while he yet spake" (Luk 22:60). the cock crew--As Mark is the only Evangelist who tells us that our Lord predicted that the cock should crow twice (Mar 14:30), so he only mentions that it did crow twice (Mar 14:72). The other Evangelists, who tell us merely that our Lord predicted that "before the cock should crow he would deny Him thrice" (Mat 26:34; Luk 22:34; Joh 13:38), mention only…”

“and: Joh 13:38; Mat 26:34, Mat 26:74, Mat 26:75; Mar 14:30, Mar 14:68, Mar 14:71, Mar 14:72; Luk 22:34, Luk 22:60-62 John 18:28”