The high priest questioned Jesus about His disciples and about His teaching.
References for John 18:19
"I have spoken openly to the world," Jesus answered him. "I have always taught in the synagogue and in the temple complex, where all the Jews congregate, and I haven't spoken anything in secret.
Why do you question Me? Question those who heard what I told them. Look, they know what I said."
When He had said these things, one of the temple police standing by slapped Jesus, saying, "Is this the way you answer the high priest?"
"If I have spoken wrongly," Jesus answered him, "give evidence about the wrong; but if rightly, why do you hit Me?"
References for John 18:23
Then Annas sent Him bound to Caiaphas the high priest.