Shahrivar’s reference is the Zoroastrianism Zoroastrianism or Mazdayasna is an Iranian religion and one of the world's oldest continuously practiced organized faiths, based on the teachings of the Iranian-speaking prophet Zoroaster. It has a dualistic cosmology of good and evil and an eschatology that predicts the ultimate conquest of evil by good. Zoroastrianism exalts an uncreated and benevolent deity of wisdom known as Ahura Mazda (lit. 'Wise Lord') as its supreme being. The unique historical features of Zoroastrianism, such as its monotheism, messianism, belief in judgement after death, the conception of heaven and hell, and free will may have influenced other religious and philosophical systems, including Gnosticism, Greek philosophy, Islam, and the Baháʼí Faith. The most important texts of Zoroastrianism are those contained within the Avesta, which includes chiefly the writings of Zoroaster known as the Gathas, as well as poems within the Yasna that define the teachings of Zoroaster, which serve as the basis for worship. The religious philosophy of Zoroaster divided the early Iranian gods of the Proto-Indo-Iranian tradition into ahuras and daevas, the latter of which were not considered to be worthy of worship. Zoroaster proclaimed that Ahura Mazda was the supreme creator, the creative and sustaining force of the universe through Asha, and that human beings are given a choice between supporting Ahura Mazda or not, making them ultimately responsible for their choices. The holy book of the Zoroastrians is called the Avesta. In fact, this is a collection of texts of different times, compiled in the Zoroastrian community in the archaic period in the ancient Iranian language, now called "Avestan". Even after the appearance of writing in Iran, for millennia the main way of transmitting texts was oral, the text keepers were priests. The well-known tradition of recording appeared only during the late Sassanids, when in the V-VI century. A special phonetic Avestan alphabet was invented to record the book. But even after that, Avestan prayers and liturgical texts were memorized by heart.