Śatapatha Brāhmaṇa ("of a hundred paths") 9.3.3.14

9.3.3.14

athāha stomaśca yajuśca ṛkca sāma sa bṛhacca rathantaraṃ ceti trayī haiṣā vidyānnaṃ vai trayī vidyānnenaivainametatprīṇātyatho annenaivainametadabhiṣiñcati svardevā agnamāmṛtā abhūmeti svarhi gacatyamṛto hi bhavati prajāpateḥ prajā abhūmeti prajāpaterhi prajā bhavati veṭ svāheti vaṣaṭkāro haiṣa paro 'kṣaṃ yadveṭkāro vaṣaṭkāreṇa vā vai svāhākāreṇa vā devebhyo 'nnam pradīyate tadenametābhyāmubhābhyām prīṇāti vaṣaṭkāreṇa ca svāhākāreṇa cātho etābhyāmevainametadubhābhyāmabhiṣañcatyatra tāṃ srucamanupprāsyati yadatrājyaliptaṃ tannedbahirdhāgnerasaditi

He then says, 'The Stoma, and the Yagus, and the Rik, and the Sâman, and the Brihat, and the Rathantara,'--this, doubtless, is the triple science, and the triple science is food: it is with food he thus gratifies him, and with food he thus consecrates him;--'to the heavenly light we gods have gone, we have become immortal,'--for he indeed goes to the heavenly light, and becomes immortal;--'Pragâpati's children have we become!'--for he indeed becomes Pragâpati's child,--'vet! svâhâ!'--the Vet-call, doubtless, is esoterically the same as the Vashat-call, and either with the Vashat-call, or the Svâhâ-call is food offered to the gods: he thus gratifies him by both the Vashat and the Svâhâ, and also consecrates him by both of them. He now throws the offering-ladle after (the ghee into the fire) lest what there is anointed with ghee should remain outside of the fire.