Albert Barnes on Luke 23:15

Nothing worthy of death is done unto him. Deserving of death. The charges are not proved against him. They had had every opportunity of proving them, first before Pilate and then before Herod, unjustly subjecting him to trial before two men in succession, and thus giving them a double opportunity of condemning him, and yet, after all, he was declared by both to be innocent. There could be no better evidence that he was innocent.