John Gill Commentary Acts 23:4

"And they that stood by said, Revilest thou God`s high priest?" — Acts 23:4 (ASV)

And those who stood by
The members of the sanhedrim that were next to the apostle; or the servants of the high priest, since they are said to stand, whereas those of that court sat: said,

Do you revile God's high priest ?
which seems to confirm that the apostle's words were not a bare prediction, but an imprecation, since they are charged with reproaching, reviling, and speaking evil of him; and the aggravation of which was not only that the person reviled was a priest, an high priest, but an high priest of God; though this could not have been proved, for there was now no high priest of God but Jesus Christ; the priesthood was changed and abrogated, and there were no more high priests among men of God's appointing and approving.