Sasanian Avesta in the context of "Avestan language"

Avestan (/əˈvɛstən/ ə-VESS-tən) is the liturgical language of Zoroastrianism. It belongs to the Iranian branch of the Indo-European language family and was originally spoken during the Avestan period (c. 1500 – 400 BCE) by the Iranians living in eastern Greater Iran as evidenced from names in Avestan geography.

After Avestan became extinct, its religious texts were transmitted orally, then collected and put into writing during the Sasanian period (c. 400 – 500 CE). The extant material falls into two groups: Old Avestan (c. 1500 – 900 BCE) and Younger Avestan (c. 900 – 400 BCE). The immediate ancestor of Old Avestan was the Proto-Iranian language, a sister language to the Proto-Indo-Aryan language, with both having developed from the earlier Proto-Indo-Iranian language. As such, Old Avestan is quite close in both grammar and lexicon to Vedic Sanskrit, the oldest preserved Indo-Aryan language.

The Avesta is the text corpus of religious literature of Zoroastrianism. All its texts are composed in the Avestan language and written in the Avestan alphabet. Modern editions of the Avesta are based on the various manuscripts that have survived in India and Iran.

The individual texts of the Avesta were originally oral compositions. They were composed over a long period of several centuries during the Avestan period (possibly ranging from 15th century BCE – 4th century BCE). The written transmission began much later during the Sasanian era (224 to 651 CE), with the creation of the Avestan alphabet. The resulting texts were then compiled into the multi-volume edition of the Sasanian Avesta. This edition was lost sometime after the 10th century CE, and only a small portion of it has survived, scattered across a number of individual manuscript traditions. The oldest surviving fragment of such a manuscript dates to 1323 CE.

The Vendidad /ˈvendi'dæd/, also known as Videvdad or Juddevdad, is the only volume of the Sasanian Avesta to be still present in the extant Avesta collection. It is assumed that its use within the Videvdad liturgy guaranteed its survival to this day.