The Avestan alphabet (Middle Persian: transliteration: dyn' dpywryh, transcription: dēn dēbīrē, ) is a writing system developed during Iran's Sasanian era (226–651 CE) to render the Avestan language. As a side effect of its development, the script was also used for Pazend, a method of writing Middle Persian that was used primarily for Zend commentaries on the texts of the Avesta. In the texts of Zoroastrian tradition, the alphabet is referred to as "the religion's script" (dēn dibīrih in Middle Persian and din dabireh in New Persian). History The development of the Avestan alphabet was initiated by the need to represent recited Avestan language texts correctly. The various text collections that today constitute the canon of Zoroastrian scripture are the result of a collation that occurred in the 4th century, probably during the reign of Shapur II (309–379). It is likely that the Avestan alphabet was an ad hoc innovation related to this – "Sassanid archetype" – collation. The enterprise, "which is indicative of a Mazdean revival and of the establishment of a strict orthodoxy closely connected with the political power, was probably caused by the desire to compete more effectively with Buddhists, Christians, and Manicheans, whose faith was based on a revealed book". In contrast, the Zoroastrian priesthood had for centuries been accustomed to memorizing scripture — following by rote the words of a teacher-priest until they had memorized the words, cadence, inflection and intonation of the prayers. This they passed on to their pupils in turn, so preserving for many generations the correct way to recite scripture. This was necessary because the priesthood considered (and continue to consider) precise and correct enunciation and cadence a prerequisite of effective prayer. Further, the recitation of the liturgy was (and is) accompanied by ritual activity that leaves no room to attend to a written text. The ability to correctly render Avestan did, however, have a direct benefit: By the common era the Avestan language words had almost ceased to be understood, which led to the preparation of the Zend texts (from Avestan zainti "understanding"), that is commentaries on and translations of the canon. The development of the Avestan alphabet allowed these commentaries to interleave quotation of scripture with explanation thereof. The direct effect of these texts was a "standardized" interpretation of scripture that survives to the present day. For scholarship these texts are enormously interesting since they occasionally preserve passages that