Śatapatha Brāhmaṇa ("of a hundred paths") 9.3.4.17

9.3.4.17

athainaṃ dakṣiṇam bāhumanuparyāvṛtyābhiṣiñcati | devasya tvā savituḥ prasave 'śvinorbāhubhyām pūṣṇo hastābhyāṃ sarasvatyai vāco yanturyantreṇāgneḥ sāmrājyenābhiṣiñcāmīti vāgvai sarasvatī tasyā idaṃ sarvaṃ yantraṃ savitṛprasūta evainametadanena sarveṇa sarasvatyai vāco yanturyantreṇāgneḥ sāmrājyenābhiṣiñcatyatra taṃ camasamanuprāsyati yadatra viliptaṃ tannedbahirdhāgnerasaditi

Placing himself near the (Sacrificer's) right arm, he then anoints him, with (Vâg. S. XVIII, 3-7), 'At the impulse of the divine Savitri, I anoint thee, by the arms of the Asvins, by the hands of Pûshan, by the support of Sarasvatî Vâk, the supporter, by the universal sovereignty of Agni!'--for Sarasvatî is Vâk (speech), and hers is all this support. Impelled by Savitri, he thus anoints him by all this support of Sarasvatî Vâk, the supporter, and by the universal sovereignty of Agni. Here he throws the cup (into the fire), lest what is anointed (with offering material) should remain outside the fire.