Śatapatha Brāhmaṇa ("of a hundred paths") 11.6.1.9

11.6.1.9

atha yānetataddakṣiṇāyāṃ diśyadrākṣīḥ puruṣaiḥ puruṣānparvāṇyeṣām parvaśaḥ saṃkartam parvaśo vibhajamānānidaṃ tavedam mameti paśavo vai te abhūvantsa yatpayasā juhoti tena paśūnavarundhe tena paśūnāṃ lokaṃ jayati

‘And as to those men whom thou sawest in the southern region being dismembered by men cutting up their limbs one by one, and saying, "This to thee, this to me!" they were the cattle; when one makes offering with milk he subdues the cattle, and conquers the world of cattle.