Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.4.3

5.3.4.3

sa sārasvatīreva prathamā gṛhṇāti | apo devā madhumatīragṛbhṇannityapo devā rasavatīragṛhṇannityevaitadāhorjasvatī rājasvaścitānā iti rasavatīrityevaitadāha yadāhorjasvatīriti rājasvaścitānā iti yāḥ prajñātā rājasva ityevaitadāha yābhirmitrāvaruṇāvabhyaṣiñcannityetābhirhi mitrāvaruṇāvabhyaṣiñcanyābhirindramanayannatyarātīrityetābhirhīndraṃ nāṣṭrā rakṣāṃsyatyanayaṃstābhirabhiṣin=cati vāgvai sarasvatī vācaivainametadabhiṣiñcatyetā vā ekā āpastā evaitatsambharati

He first takes (water) from the (river) Sarasvatî, with (Vâg. S. X, i), 'The gods took honey-sweet water,'--whereby he says, 'the gods took water full of essence;'--'sapful, deemed king-quickening,'--by 'sapful' he means to say, 'full of essence;' and by 'deemed king-quickening' he means to say, '(water) which is recognised as king-quickening;'--'wherewith they anointed Mitra and Varuna,' for therewith they did anoint (sprinkle) Mitra and Varuna;--'wherewith they guided Indra past his enemies,' for therewith they indeed guided Indra past the fiends, the Rakshas. Therewith he sprinkles him,--Sarasvatî being (the goddess of) Speech: it is with speech he thereby sprinkles him. This is one kind of water: it is that he now brings.