II. The chief priests showed utter ignorance of Scripture in their taunts
But the chief priests, for whom the Saviour sought forgiveness, rendered the torture of the cross yet worse by the barbs of railery; and at Him, on Whom they could vent no more fury with their hands, they hurled the weapons of their tongues, saying, “He saved others; Himself he cannot save. If He is the King of Israel, let Him now come down from the cross, and we believe Him.” From what spring of error, from what pool of hatred, O you Jews, do you drink such poisonous blasphemies?
What master informed you, what teaching convinced you that you ought to believe Him to be King of Israel and Son of God, who should either not allow Himself to be crucified, or should shake Himself free from the binding nails. The mysteries of the Law, the sacred observances of the Passover, the mouths of the Prophets never told you this: whereas you did find truly and oft-times written that which applies to your abominable wicked-doing and to the Lord's voluntary suffering. For He Himself says by Isaiah, “I gave My back to the scourges, My cheeks to the palms of the hand, I turned not My face from the shame of spitting.”
He Himself says by David, “They gave Me gall for My food, and in My thirst they supplied Me with vinegar,” and again, “Many dogs came about Me, the council of evil-doers beset Me. They pierced My hands and My feet, they counted all My bones. But they themselves watched and gazed on Me, they parted My raiment among them, and for My robe they cast lots.” And lest the course of your own evil doings should seem to have been foretold, and no power in the Crucified predicted, you read not, indeed, that the Lord descended from the cross, but you did read, “The Lord reigned on the tree.”
Source: Sermons (New Advent)