Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.4.7

1.7.4.7

te hocuḥ | bhagāyainaddakṣiṇata āsīnāya pariharata tadbhagaḥ prāśiṣyati tadyathāhutamevam bhaviṣyatīti tadbhagāya dakṣiṇata āsīnāya paryājahrustadbhago 'vekṣāṃ cakre tasyākṣiṇī nirdadāha tathennūnaṃ tadāsa tasmādāhurandho bhaga iti

They said, 'It has not yet become appeased here: take it round to Pûshan!' They accordingly took it round to Pûshan. Pûshan tasted it: it knocked out his teeth. And thus it came to pass. Hence they say, 'Pûshan is toothless;' and therefore, when they prepare a mess of boiled rice (karu) for Pûshan, they prepare it from ground rice, as is done for one toothless.