Avesta is the overall name given to Iranians most ancient collection of writings and composition. It is an Iranian encyclopedia and the holy scripture for followers of Zarathustra. Zoroastrians are spread throughout Iran and India. This book has survived for three millennia. The copy is the oldest, dated and the most complete copy of this text in the world and includes Vendidad, Visperad and Yasna. This edition was scribed in Yazd in the 1607 C.E. Given the fact that neither Avestan nor Pahlavi script is in current use, and the fact that the surviving texts in these languages are very rare, the present text is very important from the standpoint of linguistics and writing system research.