John 18:25

And Simon Peter was standing and warming himself. They said therefore . . . Art thou not also one of his disciples?--In Mat 26:71 the second charge was made by "another maid, when he was gone out into the porch," who "saw him, and said unto them that were there, This [fellow] was also with Jesus of Nazareth." So also Mar 14:69. But in Luk 22:58 it is said, "After a little while" (from the time of the first denial), "another [man] saw him, and said, Thou art also of them." Possibly it was thrown at him by more than one; but these circumstantial variations only confirm the truth of the narrative. He denied it, and said, I am not--in Mat 26:72, "He denied with an oath, I do not know the man." This was THE SECOND DENIAL.

Hitherto this evangelist has recorded little of the history of Christ, only so far as was requisite to introduce his discourses; but now that the time drew nigh that Jesus must die he is very particular in relating the circumstances of his sufferings, and some which the others had omitted, especially his sayings. So far were his followers from being ashamed of his cross, or endeavouring to conceal it, that this was what, both by word and writing, they were most industrious to proclaim, and gloried in it. This chapter relates, I. How Christ was arrested in the garden and surrendered himself a prisoner (Joh 18:1-12). II. How he was abused in the high priest's court, and how Peter, in the meantime, denied him (Joh 18:13-27). III. How he was prosecuted before Pilate, and examined by him, and put in election with Barabbas for the favour of the people, and lost it (Joh 18:28-40).

18:25-27 He denied it: Peter’s three denials were later echoed when Jesus invited him three times to reaffirm his love (21:15-17).