INDIAN HISTORY

Detailed explanation-1: -Avesta, also called Zend-avesta, sacred book of Zoroastrianism containing its cosmogony, law, and liturgy, the teachings of the prophet Zarathushtra (Zoroaster).

Detailed explanation-2: -Avestan. The earliest surviving literary works in an Iranian language are that of the religious texts of the Avesta, written in Avestan, an Old Iranian sacred language.

Detailed explanation-3: -The Gathas are traditionally attributed to Zarathustra, the eponymous founder of the Zoroastrian tradition. All Avestan texts were composed and transmitted orally, although presumably from the late Sasanian period onwards there also existed a written tradition.