Yasna is a central religious text of Zoroastrianism, an ancient faith founded by the prophet Zoroaster. It consists of a collection of hymns and prayers that are recited during rituals and ceremonies. The text emphasizes the importance of truth, righteousness, and the worship of Ahura Mazda, the supreme god in Zoroastrian belief. The Yasna is divided into several sections, including the Gathas, which are the oldest hymns attributed to Zoroaster himself. These hymns explore themes of morality, the nature of existence, and the struggle between good and evil. The recitation of the Yasna is a vital part of Zoroastrian worship, reflecting the faith's core principles.