Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.4.14

7.2.4.14

sarvauṣadham bhavati | sarvameva tadannaṃ yatsarvauṣadhaṃ sarvamevāsminnetadannaṃ dadhāti teṣāmekamannamuddharettasya nāśnīyādyāvajjīvamaudumbareṇa camasena tasyokto bandhuścatuḥsraktinā catasro vai diśaḥ sarvābhya evāsminnetaddigbhyo 'nnaṃ dadhātyanuṣṭubbhirvapati vāgvā anuṣṭubvāco vā annamadyate

It is (seed) of all herbs,--all herbs means all food; he thus puts all (kinds of) food into him. Let him omit one of those kinds of food, and not eat thereof as long as he lives. By means of the udumbara jar (he sows the seed): the significance of this has been explained;--with a four-cornered one,--there are four quarters: from all quarters he thus puts food into him (Agni). He sows it with anushtubh (verses),--the Anushtubh (metre) is speech, and by means of speech (the mouth) food is eaten.