Śatapatha Brāhmaṇa ("of a hundred paths") 7.1.1.22

7.1.1.22

ayaṃ so agniḥ | yasmintsomamindraḥ sutaṃ dadha ityayaṃ vai loko gārhapatya āpaḥ somaḥ suto 'smiṃstalloke 'pa indro 'dhatta jaṭhare vāvaśāna iti madhyaṃ vai jaṭharaṃ sahasriyaṃ vājamatyaṃ na saptimityāpo vai sahasriyo vājaḥ sasavāntsantstūyase jātaveda iti citaḥ saṃścīyase jātaveda ityetat

[He puts it on, with Vâg. S. XII, 47; Rik S. III, 22, 1, &c.] 'This is the Agni wherein Indra taketh the Soma-juice,' for the Gârhapatya hearth is this (terrestrial) world, and the Soma-juice is the waters: Indra thus took up the waters in this world;--'into his belly, craving it,'--for the belly is the centre;--'thousandfold strength, like a swift racer,'--the thousandfold strength, doubtless, is the waters,--'thou, having gained, art exalted, O knower of beings!' that is, 'thou, being built, art built, O knower of beings!'