The Yashts, a collection of hymns composed in Younger Avestan and addressed to individual Zoroastrian divine figures including Mithra, associated with covenant and light, and Anahita, a goddess of waters, preserve a rich body of pre-Zoroastrian Iranian mythological material that Zoroastrian orthodoxy incorporated and reinterpreted within its broader monotheistic framework centered on Ahura Mazda, illustrating how the developing Avesta absorbed and adapted older regional religious material rather than displacing it entirely.
The Vendidad, meaning the law against demons, addresses ritual purity, the treatment of corpses and other priestly legal concerns in considerable procedural detail, and remains recited during specific Zoroastrian purification and funerary rituals today, particularly within the traditional Zoroastrian practice of exposing the dead at towers of silence, dakhma, to avoid contaminating the sacred elements of earth, fire and water with a corpse's impurity.
Younger Avestan liturgical recitation, like Old Avestan, continues within Zoroastrian and Parsi communities today as a memorized ritual practice rather than a living spoken language. Younger Avestan's Yasna liturgy, recited in full during the central Zoroastrian Yasna ceremony performed by two officiating priests, structures the ritual offering of consecrated haoma juice and other elements to Ahura Mazda, making the language's correct recitation a matter of ongoing practical priestly training rather than purely historical or academic interest.