Śatapatha Brāhmaṇa ("of a hundred paths") 2.6.1.45

2.6.1.45

atha sādayitvā srucau vyūhati | srucau vyuhya paridhīntsamajya paridhimabhipadyāśrāvyāheṣitā daivyā hotāro bhadravācyāya preṣito mānuṣaḥ sūktavākāyeti sūktavākaṃ hotā pratipadyate nādhvaryuḥ prastaraṃ samullumpatītyevopāste yadā hotā sūktavākamāha

He then separates the two spoons, after laying them down (in their respective places on the altar); and having separated them, and anointed the enclosing-sticks, he takes one enclosing-stick, calls for the 'Sraushat,' and says, 'The divine Hotris are summoned for the proclamation of success, the human is called upon for the song of praise!' The Hotri intones the 'song of praise (sûktavâka).' The Adhvaryu, on the other hand, does not seize the prastara-bunch, but watches while the Hotri recites the song of praise.