Dastur
It means 'preceptor,' 'teacher,' or 'rule/custom' in Persian, derived from Middle Persian dastwar.
Yes, it was used by Persian and Balochi Muslims for religious teachers and ministers, though it has pre-Islamic Persian origins.
The word itself is not in the Quran, but the concept of divine teaching appears in verses like 2:129 and 3:164.
It is extremely rare in modern times but attested in classical Persian and Mughal historical records.
Middle Persian (Pahlavi) dastwar, adopted into New Persian and used in Balochi and Persian Muslim cultures.