Preserving the Gathas Through Priestly Oral Transmission

The Avesta's oldest portion, the Gathas, seventeen hymns traditionally attributed directly to the prophet Zoroaster himself and composed in the more archaic Old Avestan register, were preserved through a specialized priestly oral tradition for well over a thousand years before being committed to writing, comparable in its precision and religious motivation to the Vedic Sanskrit recitation tradition preserving the Rigveda across a similarly vast span of time without writing. Zoroastrian priests, mobeds, continue to recite Avestan liturgical texts today in Zoroastrian communities in Iran and among the Parsi community of India, descended from Zoroastrians who fled Iran following the seventh-century Muslim conquest, even though almost no modern practitioner speaks Avestan as anything but a memorized liturgical register entirely separate from everyday Persian or Gujarati speech.

The Bundahishn, a later Zoroastrian cosmological text, was composed not in Avestan itself but in Middle Persian, drawing on and interpreting older Avestan material, illustrating how Avestan's own scriptural authority persisted even as the practical theological and interpretive work increasingly moved into more recent Iranian languages that later generations of priests and scholars could actually read fluently.