Albert Barnes Commentary John 18:19

"The high priest therefore asked Jesus of his disciples, and of his teaching." — John 18:19 (ASV)

The high-priest then asked Jesus of his disciples. To ascertain their number and power. The charge on which they wished to arraign him was that of sedition, or of rebellion against Caesar. To make that plausible, it was necessary to show that he had made so many disciples as to form a strong and dangerous faction; but, as they had no direct proof of that, the high-priest insidiously and improperly attempted to draw the Savior into a confession. Of this he was aware, and referred him to the proper source of evidence—his open, undisguised conduct before the world.

His doctrine. His teaching. The sentiments that he inculcated. The object was doubtless to convict him of teaching sentiments that tended to subvert the Mosaic institutions, or that were treasonable against the Roman government. Either would have answered the purpose of the Jews, and they doubtless expected that he—an unarmed and despised Galilean, now completely in their power—would easily be drawn into confessions which cunning and malice could use to procure his condemnation.