Shatapatha Brahmana 5.5.4.26

5.5.4.26

sa yajati | putramiva pitarāvaśvinobhendrāvathuḥ kāvyairdaṃsanābhiḥ yatsurāmaṃ vyapibaḥ śacībhiḥ sarasvatī tvā maghavannabhiṣṇagiti dvirhotā vaṣaṭkaroti dviradhvaryurjuhotyāharati bhakṣaṃ yadyu trīngṛhṇīyādetasyaivānu homamitarau hūyete

He prays (Vâg. S. X, 34; Rik S. X, 131, 5), 'As the parents (stand by) their son, so the two Asvins have stood by thee, O Indra, with wise plans and wonderful deeds; when thou quaffedst the cheering (Soma), Sarasvatî cured thee, O Lord, by her services.' Twice the Hotri utters the Vashat, twice the Adhvaryu offers and fetches drink. And if he draw three (cups of liquor), then after the offering of that one the other two are offered.