Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.3.9

4.4.3.9

mūrdhannabhinidhāyāśrāvayati | mūrdhā hyasyaiṣo 'thāha dhānāsomebhyo 'nubrūhītyāśrāvyāha dhānāsomānprasthitānpreṣyeti vaṣaṭkṛte juhotyanuvaṣaṭkṛte 'tha dhānā vilipsante bhakṣāya

Placing (the Dronakalasa) on his head, he calls for the Sraushat,--for this (vessel) is his (Soma's) head. He first says (to the Maitrâvaruna), 'Recite (the invitatory prayer) for the Soma-draughts with grains!' Having called for the Sraushat, he says, 'Prompt (the Hotri to pronounce the offering prayer on) the Soma-draughts with grain brought forward!' and offers as the Vashat and Anuvashat are uttered. They then divide the grain between them for the sake of the Soma-draught.