Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.5.6

4.3.5.6

sa yatra prātaḥsasavane | dvidevatyaiḥ pracarati tatpratiprasthātādityapātreṇa droṇakalaśātpratinigṛhṇīta upayāmagṛhīto 'sītyetāvatādhvaryurevāśrāvayatyadhvaryoranu homaṃ juhoti pratiprasthātādityebhyastveti saṃsravamavanayatyetāvataivameva sarveṣu

Hence, when at the morning pressing he (the Adhvaryu) proceeds with the dvidevatya cups, the Pratiprasthâtri draws Soma juice from the Dronakalasa into the Âditya vessel, with this much (of the formula, Vâg. S. VIII, I), 'Thou art taken with a support!' The Adhvaryu calls for the (Agnîdh's) Sraushat, and after the Adhvaryu's libation the Pratiprasthâtri pours (his juice into the fire), and with this much 'Thee to the Âdityas!' he pours the remains (into the Âditya-sthâlî). In the same way at all (three dvidevatya libations).