Indo-Iranian languages are the eastern-most group of the living Indo-European languages. They are well represented among the oldest records of Indo-European languages. These originate around modern Afghanistan and early on split as some people went west and some went east.
... references to medieval mistakes or superstitions are
confined to several passages, viz., the merit of good
works and transubstantiation (iv. 2), purgatory
(iv. 9), and ...