The Zend Avesta ("Book of the Law")
is the principal Zoroastrian scripture. The Zend Avesta is a collection
of prayers, hymns, and other works, and includes
the Gathas, or hymns of Zoroaster. The Zend Avesta as seen today was
compiled from older oral traditions around the thirteenth century and
may have existed in a different formn much earlier. According to legend,
the original scriptures were destroyed by Alexander the Great, who is
still reviled to this day.