Śatapatha Brāhmaṇa ("of a hundred paths") 6.3.1.20

6.3.1.20

imaṃ no deva savitaryajñam praṇayeti | asau vā ādityo devaḥ savitā yadu vā eṣa yajñiyaṃ karma praṇayati tadanārtaṃ svastyudṛcamaśnute devāvyamiti yo devānavadityetatsakhividaṃ satrājitaṃ dhanajitaṃ svarjitamiti ya etatsarvaṃ vindādityetadṛcetyṛcā stomaṃ samardhaya gāyatreṇa rathantaram bṛhadgāyatravartanīti sāmāni svāheti yajūṃṣi saiṣā trayī vidyā prathamaṃ jāyate yathaivādo 'mutrājāyataivamatha yaḥ so 'gnirasṛjyataiṣa sa yo 'ta ūrdhvamagniścīyate

[Vâg. S. XI, 8] 'Further, O god Savitri, this our sacrifice!'--the god Savitri is yonder sun, and whatever sacrificial rite he furthers, that reaches its end safely and auspiciously;--'as one pleasant to the gods,'--that is, as one which shall please the gods;--'friend-gaining, ever-winning, wealth-winning, heaven-winning,'--that is, one that may gain all this;--'Make the hymn-tune successful with the rik (verse), the Rathantara with the Gâyatra (metre), and the Brihat, moving in Gâyatra measures!'--thus the sâmans (hymns);--'Hail!' thus the sacrificial formulas: this threefold science is first produced, even as it was there and then produced. And the Agni who was produced, he is this Agni (fire-altar) who is built up from hence upwards.