Śatapatha Brāhmaṇa ("of a hundred paths") 2.2.4.13

2.2.4.13

te hocuḥ | bhadraṃ vā idamajījanāmahi ye gāmajījanāmahi yajño hyetveyaṃ no hyṛte goryajñastāyate 'nnaṃ hyeveyaṃ yaddhi kiṃ cānnaṃ gaureva taditi

They said, 'Auspicious, indeed, is what we have produced here, who have produced the cow: for, truly, she is the sacrifice, and without her no sacrifice is performed; she is also the food, for the cow, indeed, is all food.'