Avestan

Avestan and Old Persian were Old Iranian languages.

Then Zoroaster brought the religion. Under the command of King Vishtaspa, a thousand and two hundred chapters were engraved and written in the Avestan script onto golden tablets, and were put as the treasure of that Fire.

The other branch of the Iranian, the Avestan, is the language of the Avesta or sacred books of the Parsees, the followers of Zoroaster, founder of the religion of the fire-worshippers.

Avestan geography

We find, fortunately preserved in the extant Avestan texts, some material that gives us a vivid idea of the importance which the ancient Iranians attached to the fulfilment of contracts.