''Shāyast ne-Shāyast'' ( MP: "Proper and Improper") is an 8th/9th-century

Zoroastrian Zoroastrianism is an Iranian religion and one of the world's oldest organized faiths, based on the teachings of the Iranian-speaking prophet Zoroaster. It has a dualistic cosmology of good and evil within the framework of a monotheistic ...

Middle Persian Middle Persian or Pahlavi, also known by its endonym Pārsīk or Pārsīg () in its later form, is a Western Middle Iranian language which became the literary language of the Sasanian Empire. For some time after the Sasanian collapse, Middle ...

compilation of miscellaneous laws and customs regarding sin and impurity, with other memoranda about ceremonies and religious subjects in general. The text contains about 13,500 words. The content of this collection are of a very varied character, but sins and good works, precautions to avoid impurities, details of ceremonies and customs, the mystic signification of the Gathas, and praise of the sacred beings are the principal subjects discussed.http://www.farvardyn.com/pahlavi4.php#54

References

{{DEFAULTSORT:Shayast ne-Shayast Zoroastrian texts Middle Persian literature