Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 3.9.21

3.9.21

śāntir eva eṣā bheṣajam yajñe kriyate /

muttering, and the muttering is the holy power; verily thus with the holy power he appeases it. Again, in that they cleanse themselves on that (part of the strew) where the strainers are, and the waters are healing and medicine, verily thus at the end in the sacrifice are healing and medicine made. Again, in that they bring up the mess of food, it is because the new and full moon sacrifices have that as the sacrificial fees; therefore they bring up the mess of food. Again, in that he addresses the kindling stick, it is because it alone is left over of the kindling fuel; therefore he celebrates it.