The Devils Deception by Imam Ibn AL-Jawzi

Chapter Five: Devil's Deception in Matters of Creed (al-'aqa'id) and Religion
[ 5:14]
The Devil's Deception of Zoroastrians (al-majus)
Ya}:iya Ibn Bishr al-NahawandI said: The first Zoroastrian king
was Komorth, then came many who claimed to be Prophets including
Zaradusht, he was the most famous of them.
They claimed that the lord was a spiritual being who appeared
suddenly, and with his appearance purely spiritual beings appeared
as well. When this happened the lord thought to himself: No one
else could have created these beings. From this thought developed
a darkness because it entailed the denial of others' abilities. So this
darkness began to battle Him.
Zaradusht prescribed fire worship, as well as praying to the sun
because it was the owner of the world, as they claimed, the bringer
of day, the eliminator of night, the reviver of plants and animals,
and the generator of heat.
They never buried their deceased out of respect to Earth because
all living things grew from it. They also never used water for bathing
out of respect to it, the livelihood of all things. They utilized
cow urine and never spat in it.
They considered it forbidden to kill or slaughter animals, and they
used to wash their faces with cow urine in order to gain blessings.
In addition, they considered it permissible for a man to have relations
with his mother on the basis that a son was most worthy of
fulfilling his mother's sexual urges. And whenever a man died then
his son took over his widow. They also allowed a man to marry one
hundred or one thousand women. And when a women used to
perform ablution after her monthly period, she would go to the tern-
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