Śatapatha Brāhmaṇa ("of a hundred paths") 9.3.3.17

9.3.3.17

tasyai yajāmāna evātmām | bāhurūdhaḥ srukṣtano dhāraiva dhārā yajamānādadhi devāndevebhyo 'dhi gāṃ goradhi yajamānaṃ tadetadanantamakṣayyaṃ devānāmannam pariplavate sa yo haitadevaṃ vedaivaṃ haivāsyaitadanantamakṣayyamannam bhavatyathātaḥ sampadevaḥ

Its body is the Sacrificer, its udder his arm, its teat the offering-ladle, its shower (of milk) the shower of (ghee): from the Sacrificer (it goes) to the gods; from the gods to the cow, from the cow to the Sacrificer: thus circulates this perpetual, never-ending food of the gods. And, verily, for whosoever knows this, there will thus be perpetual, never-ending food. Now as to the (mystic) correspondence.