Scripture proceeds:

The soul of the pure man goes the first step and arrives at
(the Paradise) Humata; the soul of the pure man takes the
second step and arrives at (the Paradise) Hukhta; it goes the
third step and arrives at (the Paradise) Hvarst; the soul of
the pure man takes the fourth step and arrives at the Eternal
Lights.

To it speaks a pure one deceased before, asking it: How art
thou, O pure deceased, come away from the fleshy dwellings,
from the earthly possessions, from the corporeal world hither
to the invisible, from the perishable world hither to the
imperishable, as it happened to thee--to whom hail!

Then speaks Ahura-Mazda: Ask not him whom thou asketh, (for)
he is come on the fearful, terrible, trembling way, the
separation of body and soul.[3]

The Persian _Desatir_ speaks with equal definiteness. This work
consists of fifteen books, written by Persian prophets, and was
written originally in the Avestaic language; "God" is Ahura-Mazda, or
Yazdan:

God selected man from animals to confer on him the soul,
which is a substance free, simple, immaterial, non-compounded
and non-appetitive. And that becomes an angel by improvement.

By his profound wisdom and most sublime intelligence, he
connected the soul with the material body.