deu - [IC] Then it was necessary for you to decree the reason that in Ērānšahr all purifiers always purify {or: one always purifies the complete ablution?} as (it is) evident as (lit.: for) improper by whatever authority it is declared (or) written.
deu - [West1882] ... then it was necessary for you to determine the reason that all the purifiers of the country of Irân always wash that way that is declared as improper, with whatever certainty it be uttered or written.