Avesta
The Yasna

The Yasna (from yazišn "worship, oblations", cognate with Sanskrit yajña), is the primary liturgical collection, named after the ceremony at which it is recited. It consists of 72 sections called the Ha-iti or Ha. The 72 threads of lamb's wool in the Kushti, the sacred thread worn by Zoroastrians, represent these sections. The central portion of the Yasna is the Gathas, the oldest and most sacred portion of the Avesta, believed to have been composed by Zarathushtra (Zoroaster) himself. The Gathas are structurally interrupted by the Yasna Haptanghaiti ("seven-chapter Yasna "), which makes up chapters 35–42 of the Yasna and is almost as old as the Gathas, consists of prayers and hymns in honor of Ahura Mazda, the Yazatas, the Fravashi, Fire, Water, and Earth. The younger Yasna, though handed down in prose, may once have been metrical, as the Gathas still are.
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