Proper noun
(Zoroastrianism) The primary liturgical collection of texts of the Avesta.
(Zoroastrianism) The principal Zoroastrian act of worship at which those verses are recited.
Source: en.wiktionary.orgHaug also interpreted the concept of a free will of Yasna 45.9 as an accommodation to explain where Angra Mainyu came from since Ahura Mazda created only good. Source: Internet
Thus, in Zoroaster's revelation, Ahura Mazda was perceived to be the creator of only the good (Yasna 31.4), the "supreme benevolent providence" (Yasna 43.11), that will ultimately triumph (Yasna 48.1). Source: Internet
However, in Yasna 59.18, the zaraϑuštrotema, or supreme head of the Zoroastrian priesthood, is said to reside in 'Ragha'. Source: Internet