Śatapatha Brāhmaṇa ("of a hundred paths") 11.6.1.10

11.6.1.10

atha yānetatpratīcyāṃ diśyadrākṣīḥ puruṣaiḥ puruṣāṃstūṣṇīmāsīnāṃstūṣṇīmāsīnairadyamānānoṣadhayo vai tā abhūvantsa yattṛṇenāvajyotayati tenauṣadhīravarunddhe tenauṣadhīnāṃ lokaṃ jayati

‘And as to those men thou sawest in the western region who, whilst sitting still, were being eaten by men sitting still, they were the herbs: when one illumines (the Agnihotra milk) with a straw, he subdues the herbs, and conquers the world of herbs.