Shatapatha Brahmana 9.1.2.23

9.1.2.23

yadvevainaṃ vikarṣati | jāyata eṣa etadyaccīyate sa eṣa sarvasmā annāya jāyate sarvamvetadannaṃ yanmaṇḍūko 'vakā vetasaśākhā paśavaśca hyetā āpaśca vanaspatayaśca sarveṇai vainametadannena prīṇāti

And, again, why he draws them across it;--when he (Agni, the fire-altar) is built up, he is being born, and he is born for every kind of food; and these are every kind of food, to wit, the frog, the lotus-flower, and the bamboo-shoot, for these, indeed, are animals, water, and trees: with all this food he gratifies him.