Śatapatha Brāhmaṇa ("of a hundred paths") 8.5.3.2

8.5.3.2

sa yaḥ sa prajāpatiḥ | ayameva sa yo 'yamagniścīyate 'tha yattadannametāstāścandasyā atha yaḥ so 'nnasya rasa etāstā stomabhāgā atha yaḥ sa indro 'sau sa ādityaḥ sa eṣa eva stomo yaddhi kiṃ ca stuvata etameva tena stuvanti tasmā etasmai stomāyaitam bhāgam prāyacattadyadetasmai stomāyaitam bhāgam prāyacattasmātstomabhāgāḥ

Now he who was that Pragâpati is this very Agni (the fire-altar) that is now being built up; and that food is these Khandasyâ (bricks); and that essence of food is these Stomabhâgâs; and he who was Indra is yonder Âditya (the sun): he indeed is the Stoma (hymn of praise), for whatsoever praises they sing, it is him they praise thereby,--it is to that same Stoma he gave a share; and inasmuch as he gave a share (bhâga) to that Stoma, these are (called) Stomabhâgâs.