Śatapatha Brāhmaṇa ("of a hundred paths") 6.6.4.2

6.6.4.2

atha prātarudita āditye | bhasmaiva prathamamudvapatyetadvā enametenānnena prīṇātyetayā samidhā yacca rātryopasamādadhāti tasyānnasya jagghasyaiṣa pāpmā sīdati bhasma tenainametadvyāvartayati tasminnapahatapāpmanvācaṃ visṛjate vācaṃ visṛjya samidhamādadhātyahna evainametadannena prīṇātyaharaharaprayāvam bharanta iti tasyokto bandhurahna evaitāmariṣṭiṃ svastimāśāste tadyatkiṃ cāto 'hnopasamādadhātyāhutikṛtaṃ haivāsmai tadupasamādadhāti

And in the morning, when the sun has risen, he in the first place throws out the ashes. For at that (former) time he regales him with that food, that kindling-stick; and the foul part of that eaten food which he puts on during the night sinks to the bottom as ashes. He now clears him thereof, and infuses speech into him thus freed from foulness. Having infused speech, he puts on a kindling-stick,--and thereby regales him with food for the day--with, 'Day by day bearing unremittingly;'--the meaning of this has been told: he prays for that same security and well-being for the day; and whatsoever he puts on thereafter by day, that he puts on as a libation offered to him.