The Avesta / əˈvɛstə / is the primary collection of religious texts of Zoroastrianism, composed in the otherwise unrecorded Avestan language. Collected during the Sassanid Period of much more ancient oral accounts, according to Jean Kellens, "The book was originally given the name abestag, which the Parsees later turned into Avesta and which probably comes from the Old Iranian upa - stavaka, ' praise (of Ahura Mazda) '. ''.
of which religion is the avesta a sacred book
Zoroastrianism