Soma (Sanskrit), or Haoma (Avestan), from Proto-Indo-Iranian *sauma-, was a ritual drink of importance among the early Indo-Iranians, and the later Vedic and greater Persian cultures. It is frequently mentioned in the Rigveda, which contains many hymns praising its energizing or intoxicating qualities. In the Avesta, Haoma has an entire Yasht dedicated to it.
It is described as prepared by pressing juice from the stalks of a certain mountain plant, which has been variously hypothesized to be a psychedelic mushroom, cannabis, peganum harmala, or ephedra. In both Vedic and Zoroastrian tradition, the drink is identified with the plant, and also personified as a divinity, the three forming a religious or mythological unity.
The plant is described as growing in the mountains (giristha, cf. Orestes), with long stalks, and of yellow or tawny (hari) colour. The drink is prepared by priests pounding the stalks with stones, an occupation that creates tapas (literally "heat", later referring to "spiritual excitement" in particular). The juice so gathered is mixed with other ingredients (including milk and honey) before it is drunk.
Growing far away, in the mountains, Soma had to be purchased from travelling traders. This is connected with the Indo-Aryan migration model, i.e. the plant supposedly grew in the homeland of the Indo-Iranians, probably the Hindukush, but later migration to the Punjab removed them from the area of its occurrence, and it had to be imported. Later, knowledge of the plant was lost altogether, and Indian ritual reflects this, in expiatory prayers apologizing to the gods for the use of a substitute plant (e.g. rhubarb) because Soma had become unavailable.
The famous ayurvedic scholar Susruta wrote that the best Soma is found in the upper Indus and Kashmir region (Susruta Samhita: 537-538, SS.CS. 29.28-31).
The continuing importance of Haoma in Zoroastrianism may be glimpsed from the Avesta (particularly in the Hōm Yast, Yasna 9.11), and Avestan language *hauma also survived as middle Persian hōm. The plant Haoma yielded the essential ingredient for the ritual drink, parahaoma.
In the Hōm yašt of the Avesta, the Yazata (divine) Haoma appears to Zoroaster "at the time of pressing" (havani ratu) in the form of a beautiful man. Yasna 9.1 and 9.2 exhort him to gather and press Haoma plants. Haoma's epitheta include "the Golden-Green One" (zairi-, Sanskrit hari-), "righteous" (ašavan-), "furthering righteousness" (aša-vazah-), and "of good wisdom" (hu.xratu-, Sanskrit sukratu-).
In Yasna 9.22, Haoma grants "speed and strength to warriors, excellent and righteous sons to those giving birth, spiritual power and knowledge to those who apply themselves to the study of the nasks". As the religion's chief cult divinity he came to be perceived as its divine priest. In Yasna 9.26, Ahura Mazda is said to have invested him with the sacred girdle, and in Yasna 10.89, to have installed Haoma as the "swiftly sacrificing zaotar" (Sanskrit hotar) for himself and the Amesha Spenta. Haoma services were celebrated until the 1960s in a strongly conservative village near Yazd.
There has been much speculation as to the original Proto-Indo-Iranian Sauma plant. It was generally assumed to be hallucinogenic, based on RV 8.48 cited above. But note that this is the only evidence of hallucinogenic properties, in a book full of hymns to Soma. The typical description of Soma is associated with excitation and tapas. Soma is associated with the warrior-god Indra, and appears to have been drunk before battle. For these reasons, there are energizing plants as well as hallucinogenic plants among the candidates that have been suggested. In fact, several texts like the Atharva Veda extol the medicinal properties of Soma and he is regarded as the king of medicinal herbs (and also of the Brahmana class).
Since the late 1700s, when Anquetil-Duperron and others made portions of the Avesta available to western scholarship, several scholars have sought a representative botanical equivalent of the haoma as described in the texts and as used in living Zoroastrian practice. Most of the proposals concentrated on either linguistic evidence or comparative pharmacology or reflected ritual use. Rarely were all three considered together, which usually resulted in such proposals being quickly rejected.
In the late 19th century, the highly conservative Zoroastrians of Yazd (Iran) were found to use Ephedra (genus Ephedra), which was locally known as hum or homa and which they exported to the Indian Zoroastrians. (Aitchison, 1888) The plant, as Falk also established, requires a cool and dry climate, i.e. it does not grow in India (which is either too hot or too humid or both) but thrives in central Asia. Later, it was discovered that a number of Iranian languages and Persian dialects have hom or similar terms as the local name for some variant of Ephedra. Considered together, the linguistic and ritual evidence appeared to conclusively establish that haoma was some variant of Ephedra.
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