15 Now Simon Peter and the other disciple were following Jesus. Since that disciple was known to the high priest, he also went with Jesus into the courtyard of the high priest.
John 18:15 Cross References - MSB
Matthew 26:3
3 At that time the chief priests, scribes, and elders of the people assembled in the courtyard of the high priest, whose name was Caiaphas,
Matthew 26:58-68
58 But Peter followed Him at a distance, right up to the courtyard of the high priest. And he went in and sat down with the guards to see the outcome.
59 Now the chief priests, the elders, and the whole Sanhedrin were seeking false testimony against Jesus in order to put Him to death.
60 But they did not find any, though many false witnesses came forward. Finally two false witnesses came forward
61 and declared, “This man said, ‘I am able to destroy the temple of God and rebuild it in three days.’”
62 So the high priest stood up and asked Him, “Have You no answer? What are these men testifying against You?”
63 But Jesus remained silent. Then the high priest said to Him, “I charge You under oath by the living God: Tell us if You are the Christ, the Son of God.”
64 “You have said it yourself,” Jesus answered. “But I say to all of you, from now on you will see the Son of Man sitting at the right hand of Power and coming on the clouds of heaven.”
65 At this, the high priest tore his clothes and declared, “He has blasphemed! Why do we need any more witnesses? Look, now you have heard His blasphemy.
66 What do you think?” “He deserves to die,” they answered.
67 Then they spit in His face and struck Him. Others slapped Him
68 and said, “Prophesy to us, Christ! Who hit You?”
Mark 14:54
54 Peter followed Him at a distance, right into the courtyard of the high priest. And he sat with the officers and warmed himself by the fire.
Luke 22:54
54 Then they seized Jesus, led Him away, and took Him into the house of the high priest. And Peter followed at a distance.