Śatapatha Brāhmaṇa ("of a hundred paths") 10.2.6.17

10.2.6.17

athādhiyajñam yadevāgnāvannamupadhīyate tadannaṃ yā āpastatpānam pariśrita eva śrīstaddhi rātrīṇāṃ rūpaṃ yajuṣmatyo jyotistaddhyahnāṃ rūpamagniraṃ!taṃ taddhyādityasya rūpamityu evādhiyajñam

Now as to the sacrifice. Whatever food is placed on the fire, that is its food, and whatever water, that is its water; its well-being is the enclosing-stones, for they are of the nature of nights; its light the (bricks) with special formulas, for they are of the nature of days; and its immortal element the fire, for that is of the nature of the sun. Thus much as to the sacrifice.