Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.1.23

4.2.1.23

athāśrāvyāha | prātaḥprātaḥ savasya śukravato madhuścuta indrāya somānprasthitānpreṣyeti vaṣaṭkṛte 'dhvaryurjuhoti tadanu pratiprasthātā tadanu camasādhvaryavaḥ

He then calls (on the Agnîdh) for the Sraushat, and says, 'Urge thou for Indra the Soma-draughts brought forward, the pure, sweet-flowing, of the morrow's morning feast!' As the Vashat is uttered, the Adhvaryu offers; then the Pratiprasthâtri; then the cup-bearers (kamasâdhvaryu).