Śatapatha Brāhmaṇa ("of a hundred paths") 2.5.3.5

2.5.3.5

tasyāvṛt | saiva stīrṇā vedirbhavati yā marudbhyaḥ sāṃtapanebhyastasyāmeva stīrṇāyāṃ vedau paridhīṃśca śakalāṃścopanidadhati tathā saṃdohya caruṃ śrapayati śrapayitvābhighāryodvāsayati

The practice, in regard to this (pap, is as follows). The same altar covered (with sacrificial grass) which served for the (oblation to) the Maruts, the Scorchers, is (now used). Near this covered altar they lay down the enclosing-sticks and pieces of wood. Having had (the cows) milked in the same way (as before), he (the Adhvaryu) cooks the pap; and having cooked it and basted it with butter, he removes it from the fire.