Śatapatha Brāhmaṇa ("of a hundred paths") 11.6.1.11

11.6.1.11

atha yānetadudīcyāṃ diśyadrākṣīḥ puruṣaiḥ puruṣānākrandayata ākrandayadbhiradyamānānāpo vai tā abhūvantsa yadapaḥ pratyānayati tenāpo'varunddhe tenāpāṃ lokaṃ jayati

‘And as to those men thou sawest in the northern region who, whilst crying aloud, were being eaten by men crying aloud, they were the waters: when one pours water to (the Agnihotra milk), he subdues the waters, and conquers the world of waters.