Yasna

The Yasna is the central act of Zoroastrian worship, a long liturgy of seventy two chapters recited in its entirety by an ordained priest, the zaotar, standing before the sacred fire with a second assisting priest and using a fixed set of consecrated ritual implements, a performance that in its full form takes several hours and is understood as a complete, structured act of worship rather than a set of separable devotions a worshipper might perform in part.

At the Yasna's core sit the Gathas, seventeen hymns attributed to Zoroaster himself and composed in an older form of Avestan than the surrounding liturgy, considered the oldest and most sacred layer of Zoroastrian scripture and the closest surviving textual connection to the prophet's own teaching, embedded within the later liturgical structure that grew up around them across the following centuries of the Avestan textual tradition's development and transmission. The seventy two chapters are themselves given ritual significance beyond their content, since the number corresponds to the seventy two strands into which the kusti, the sacred cord every initiated Zoroastrian wears, is woven, a numerical correspondence Zoroastrian tradition treats as meaningful rather than coincidental, tying the priest's recitation directly to the physical symbol every believer carries on their own body.

The Yasna functions as the ritual base on which several of Zoroastrianism's grander liturgies are built rather than standing entirely alone: the Visperad extends the Yasna with additional sections of invocation for major festival days, and the demanding nocturnal Vendidad service interweaves the full Yasna and Visperad with the Avestan legal and purity text against which it is named, so that understanding the Yasna's structure is a prerequisite for understanding the tradition's other high liturgies rather than one liturgy among several unconnected options.

Consecrated haoma, a ritually prepared plant offering with deep roots in the shared Indo Iranian religious inheritance also reflected in the Vedic soma sacrifice, is prepared and offered during the Yasna, a ritual echo of a common ancestral practice the two traditions, Zoroastrian and Vedic, are understood by scholars of comparative Indo Iranian religion to have inherited independently from a shared earlier source rather than borrowed from one another. The Yasna remains a living, regularly performed rite among Zoroastrian communities today, both in Iran and among the Parsi community of India and the wider Zoroastrian diaspora, performed by trained priests in properly consecrated fire temples, a continuity of priestly recitation reaching back, in its core textual content, to among the oldest continuously used liturgies still practised anywhere in the world.