Vendidad (Videvdad) or Laws Against the Demons

The Videvdad (or Vendidad) is an ancient collection of Zoroastrian myths, prayers, and religious observances, intended to defend against sources of infection and evil. Particular attention is given to disposal of the dead and other "dead matter" (nasu), to keep disease from spreading, as well as avoid polluting the earth, water, etc. Its present form is thought to have become fixed around the middle of the first millennium BCE.