10 Whence “troubled”? Who troubling? Let us see in what manner he brands an evil conscience upon the Jews, wishing to excuse themselves of the slaying of the Lord. For to this end, as the Gospel speaks, to the judge they delivered Him, that they might not themselves seem to have killed Him....Let us question Him, and say, since You have slept troubled, who have persecuted You? Who have slain You? Was it perchance Pilate, who to soldiers gave You, on the Tree to be hanged, with nails to be pierced?
Hear who they were, “Sons of men”. Of them He speaks, whom for persecutors He suffered. But how did they slay, that steel bare not? They that sword drew not, that made no assault upon Him to slay; whence slew they? “Their teeth are arms and arrows, and their tongue a sharp sword.” Do not consider the unarmed hands, but the mouth armed: from thence the sword proceeded, wherewith Christ was to be slain: in like manner also as from the mouth of Christ, that wherewith the Jews were to be slain.
For He has a sword twice whetted: and rising again He has smitten them, and has severed from them those whom He would make His faithful people. They an evil sword, He a good sword: they evil arrows, He good arrows. For He has Himself also arrows good, words good, whence He pierces the faithful heart, in order that He may be loved. Therefore of one kind are their arrows, and of another kind their sword. “Sons of men, their teeth are arms and arrows, and their tongue a sharp sabre.” Tongue of sons of men is a sharp sabre, and their teeth arms and arrows. When therefore did they smite, save when they clamoured, “Crucify, crucify”?
Source: The Enarrations, or Expositions, on the Psalms (New Advent)