From BORIS GODUNOV, the opera for Childermass, from the scene outside St. Basil's Cathedral:

THE HOLY FOOL: Boris, ah Boris, those wicked boys are nasty to me. They took my only coin away. Why don't you have them killed, just like you killed our Tsarevich?
PRINCE SHUISKY: Silence, fool! Arrest the stupid fool!
TSAR BORIS: Leave him alone. -- Pray for me, holy man.
HOLY FOOL: No, Boris. I cannot pray for you. I must not pray for a child's murderer. I must not pray for Tsar Herod. Do not pray for him, says the Mother of God.

(General shock. Boris clutches his chest and moves on.)