IV (15-20). Why Ahura, whie forbidding man to defile water, sends water from the heavens down to the Dakhmas, covered with corpses. How he purifies that water
I (1-3). Angra Mainyu sends the demon Bûiti to kill Zarathusra: Zarathusra sings aloud the Ahuna-Vairya, and the demon flies away, confounded by the sacred words and by the Glory of Zarathustra