Śatapatha Brāhmaṇa ("of a hundred paths") 2.5.2.38

2.5.2.38

savye pāṇāvadhvaryuḥ | srucau kṛtvā dakṣiṇena pratiprasthāturvā so 'nvārabhyāha marudbhyo 'nubrūhītyupastṛṇīta ājyam pratiprasthātāthāsyai mārutyai payasyāyai dviravadyati so 'nyatareṇāvadānena saha meṣīmavadadhātyathopariṣṭādājyasyābhighārayati pratyanaktyavadāne atikrāmatyathādhvaryurevāśrāvyāha maruto yajeti vaṣaṭkṛte juhoti

Thereupon the Adhvaryu takes both spoons in his left hand; and taking hold of the Pratiprasthâtri's garment, says (to the Hotri), 'Pronounce the invitatory prayer to the Maruts!' The Pratiprasthâtri then makes an 'under-layer' of butter (in his guhû and two cuttings from the curds of the Maruts, and with either of the two cuttings puts the ewe (in the spoon). He then pours butter thereon, replenishes (the place of) the two cuttings, and steps across (to the south of the fire). The Adhvaryu, having called for the 'Sraushat,' says (to the Hotri), 'Pronounce the offering-prayer to the Maruts!' and on the 'Vashat' being uttered, (the Pratiprasthâtri) he pours out the oblation.