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Yasna (ˈjʌsnə; ,) is the Avestan name of Zoroastrianism's principal act of worship. It is also the name of the primary liturgical collection of Avesta texts, recited during that yasna ceremony. The function of the yasna ceremony is, very roughly described, to strengthen the orderly spiritual and material creations of Ahura Mazda against the assault of the destructive forces of Angra Mainyu. The yasna service, that is, the recitation of the Yasna texts, culminates in the apæ zaothra, the "offering to the waters." The ceremony may also be extended by recitation of the Visperad and Vendidad texts. A normal yasna ceremony, without extensions, takes about two hours when it is recited by an experienced priest. The Yasna texts constitute 72 chapters altogether, composed at different times and by different authors. The middle chapters include the (linguistically) oldest texts of the Zoroastrian canon. These very ancient texts, in the very archaic and linguistically difficult Old Avestan language, include the four most sacred Zoroastrian prayers, and also 17 chapters consisting of the five Gathas, hymns that are considered to have been composed by Zoroaster himself. Several sections of the Yasna include exegetical comments. Yasna chapter and verse pointers are traditionally abbreviated with Y. The Avestan language word yasna literally means 'oblation' or 'worship'. The word is linguistically and functionally related to Vedic Sanskrit yajna. The theological function of the yasna ceremony, and the proper performance of it, is to further asha, that is, the ceremony aims to strengthen that which is right/true (one meaning of asha) in the existence/creation (another meaning of asha) of divine order (yet another meaning of asha). The Encyclopedia Iranica summarizes the aim of the yasna ceremony as "the maintenance of the cosmic integrity of the good creation of Ahura Mazdā." Zoroastrianism's cosmological/eschatological perception of the purpose of humankind is to strengthen the orderly spiritual and material creations of Mazda against the assault of the destructive forces of Angra Mainyu.

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Asha

Asha (ˈʌʃə) or arta (ˈɑrtə; 𐬀𐬴𐬀 Aṣ̌aArta) is a Zoroastrian concept with a complex and highly nuanced range of meaning. It is commonly summarized in accord with its contextual implications of 'truth' and 'right' (or 'righteousness'), 'order' and 'right working'. For other connotations, see Meaning below. It is of cardinal importance to Zoroastrian theology and doctrine. In the moral sphere, aṣ̌a/arta represents what has been called "the decisive confessional concept of Zoroastrianism".

Yazata

Yazata (𐬫𐬀𐬰𐬀𐬙𐬀) is the Avestan word for a Zoroastrian concept with a wide range of meanings but generally signifying (or used as an epithet of) a divinity. The term literally means "worthy of worship or veneration", and is thus, in this more general sense, also applied to certain healing plants, primordial creatures, the fravashis of the dead, and to certain prayers that are themselves considered holy. The yazatas collectively are "the good powers under Ahura Mazda", who is "the greatest of the yazatas".

Yasht

The Yashts are a collection of twenty-one hymns in the Younger Avestan language. Each of these hymns invokes a specific Zoroastrian divinity or concept. Yasht chapter and verse pointers are traditionally abbreviated as Yt. The word yasht derives from Middle Persian 𐭩𐭱𐭲 yašt (“prayer, worship”) probably from Avestan 𐬫𐬀𐬱𐬙𐬀‎ (yašta, “honored”), from 𐬫𐬀𐬰‎ (yaz, “to worship, honor”), from Proto-Indo-European *yeh2ǵ- or *Hyaǵ-, and several hymns of the Yasna liturgy that "venerate by praise" are—in tradition—also nominally called yashts.

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