15 And Simon Peter followed Jesus, and so did another disciple. Now that disciple was known to the high priest, and went with Jesus into the courtyard of the high priest. 16 But Peter stood at the door outside. Then the other disciple, who was known to the high priest, went out and spoke to her who kept the door, and brought Peter in. 17 Then the servant girl who kept the door said to Peter, "You are not also one of this Man's disciples, are you?" He said, "I am not." 18 Now the servants and officers who had made a fire of coals stood there, for it was cold, and they warmed themselves. And Peter stood with them and warmed himself.
19 The high priest then asked Jesus about His disciples and His doctrine. 20 Jesus answered him, "I spoke openly to the world. I always taught in synagogues and in the temple, where the Jews always meet, and in secret I have said nothing. 21 Why do you ask Me? Ask those who have heard Me what I said to them. Indeed they know what I said." 22 And when He had said these things, one of the officers who stood by struck Jesus with the palm of his hand, saying, "Do You answer the high priest like that?" 23 Jesus answered him, "If I have spoken evil, bear witness of the evil; but if well, why do you strike Me?" 24 Then Annas sent Him bound to Caiaphas the high priest.
25 Now Simon Peter stood and warmed himself. Therefore they said to him, "You are not also one of His disciples, are you?" He denied it and said, "I am not!" 26 One of the servants of the high priest, a relative of him whose ear Peter cut off, said, "Did I not see you in the garden with Him?" 27 Peter then denied again; and immediately a rooster crowed.
Matthew Henry's Commentary on John 18:15-27
Commentary on John 18:13-27
(Read John 18:13-27)
Simon Peter denied his Master. The particulars have been noticed in the remarks on the other Gospels. The beginning of sin is as the letting forth of water. The sin of lying is a fruitful sin; one lie needs another to support it, and that another. If a call to expose ourselves to danger be clear, we may hope God will enable us to honour him; if it be not, we may fear that God will leave us to shame ourselves. They said nothing concerning the miracles of Jesus, by which he had done so much good, and which proved his doctrine. Thus the enemies of Christ, whilst they quarrel with his truth, wilfully shut their eyes against it. He appeals to those who heard him. The doctrine of Christ may safely appeal to all that know it, and those who judge in truth bear witness to it. Our resentment of injuries must never be passionate. He reasoned with the man that did him the injury, and so may we.