Śatapatha Brāhmaṇa ("of a hundred paths") 2.5.4.2

2.5.4.2

tasyāvṛt | upakirantyuttaravediṃ gṛhṇanti pṛṣadājyam manthantyagniṃ navaprayājam bhavati navānuyājaṃ trīṇi samiṣṭayajūṃṣi bhavantyathaitānyeva pañca havīṃṣi bhavanti

The mode of its performance (is as follows): They raise an uttara-vedi; they use clotted butter; and they churn the fire. There are nine fore-offerings and nine after-offerings, and three Samishtayagus. In the first place there are those five oblations.