>>18082771
>Reptiles, amphibians, and certain insects were categorized as “khrafstra” (Avestan: xrafstra) — noxious creatures created by Ahriman to spoil the good creation of Ahura Mazda.
They were thought to infest stagnant water, decay, and darkness, all symbols of disorder and impurity.
Persians before Islam: Only zagros mountain running water is pure not river water with all its amphibious creatures.
Persians after Islam: Water doesn't get dirty, you can use stagnant dead water.