The adhvaryu was in charge of the physical details of the sacrifice (in particular the adhvara, a term for the Somayajna). According to Monier-Williams, the adhvaryu “had to measure the ground, to build the altar, to prepare the sacrificial vessels, to fetch wood and water, to light the fire, to bring the animal and immolate it,” among other duties. Each action was accompanied by supplicative or benedictive formulas (yajus), drawn from the yajurveda. Over time, the role of the adhvaryu grew in importance, and many verses of the ṛgveda were incorporated, either intact or adapted, into the texts of the yajurveda.
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