John 18:15

And - another disciple - Not That other disciple, for the article is omitted by AD, two others; some editions; Syriac, Persic, Gothic, and Nonnus. So the Vulgate is to be understood. There are many conjectures who this disciple was: Jerome, Chrysostom, Theophylact, Nonnus, Lyra, Erasmus, Piscator, and others, say it was John. It is true John frequently mentions himself in the third person; but then he has always, whom Jesus loved, as in John 13:23; John 19:26; John 21:7, John 21:20, except in John 19:35, where he has plainly pointed out himself as writer of this Gospel; but, in the place before us, he has mentioned no circumstance by which that disciple may be known to be John. To this may be added that John being not only a Galilean, but a fisherman by trade, it is not likely that he should have been known to the high priest, as it is here said of that disciple who followed Jesus with Peter. See Bishop Pearce and Calmet. The conjecture of Grotius is the most likely: viz. that it was the person at whose house Jesus had supped. St. Augustin, Tract. 113, speaks like a man of sound sense: We should not decide hastily, says he, on a subject concerning which the Scripture is silent.

See the notes at Matthew 26:57-58.

Another disciple - Not improbably John. Some critics, however, have supposed that this disciple was one who dwelt at Jerusalem, and who, not being a Galilean, could enter the palace without suspicion. John, however, mentions the circumstance of his being known to them, to show why it was that he was not questioned as Peter was. It is not probable that any danger resulted from its being known that he was a follower of Jesus, or that any harm was meditated on them for this. The questions asked Peter were not asked by those in authority, and his apprehensions which led to his denial were groundless.