Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.3.2

2.4.3.2

tadu hovāca yājñavalkyaḥ | devāśca vā asurāścobhaye prājāpatyāḥ paspṛdhire tato 'surā ubhayīrośadhīryāśca manuṣyā upajīvanti yāśca paśavaḥ kṛtyayeva tvadviṣeṇeva tvatpralilipurutaivaṃ ciddevānabhibhavemeti tato na manuṣyā āśurna paśava āliliśire tā hemāḥ prajā anāśakena notparābabhūvuḥ

And Yâgñavalkya also spake:--The gods and the Asuras, both of them sprung from Pragâpati, once contended for superiority. The Asuras then defiled, partly by magic, partly with poison, both kinds of plants--those on which men and beasts subsist--hoping that in this way they might over come the gods. In consequence of this neither did men eat food, nor did beasts graze; and from want of food these creatures well-nigh perished.