Śatapatha Brāhmaṇa ("of a hundred paths") 5.5.4.24

5.5.4.24

sa gṛhṇāti | kuvidaṅga yavamanto yavaṃ cidyathā dāntyanupūrvaṃ viyūya ihehaiṣāṃ kṛṇuhi bhojanāni ye barhiṣo namauktiṃ yajanti upayāmagṛhīto 'syaśvibhyāṃ tvā sarasvatyai tvendrāya tvā sutrāmṇa iti yadyu trīngṛhṇīyādetayaiva gṛhṇīyādupayāmaistu tarhi nānā gṛhṇīyādathāhāśvibhyām sarasvatyā indrāya sutrāmṇe 'nubrūhīti

He draws it with (Vâg. S. X, 32), 'Yea, even as the owners of barley cut their barley, spreading it asunder in due order, so hither, hither, bring thou the nourishments of them that offer up the devotional invocation of the Barhis!--Thou art taken with a support--thee for the Asvins, thee for Sarasvatî, thee for Indra, the good protector!' And if he draw three (cups), let him draw them with that same (verse); but let him in that case draw them with separate 'supports.' He then says, 'Recite the invitatory prayer to the Asvins, to Sarasvatî, and to Indra Sutrâman!'