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The pounding of the plant in a stone mortar, and the preparation from it of the offering to the waters, forms a major part of the yasna ritual; and a concept developed from this ritual of the ‘green-eyed’ god Haoma, the divine priest, who was also invoked as a healer, and one who could protect cattle, give strength to fighting men, and ward off drought and famine.

(Mary Boyce, Zoroastrians, ch. 1)