Śatapatha Brāhmaṇa ("of a hundred paths") 5.1.3.5

5.1.3.5

dvedhāvadānāni śrapayanti | tato 'rdhānāṃ juhvāmupastīrya dvirdviravadyati sakṛdabhighārayati pratyanaktyavadānānyathopabhṛti sakṛtsakṛdavadyati dvirabhighārayati na pratyanaktyavadānāni tadyadardhānāṃ dvirdviravadyati tathaiṣā kṛtsnām bhavatyatha yadetaiḥ pracarati tena daivīṃ viśamujjayatyathārdhāni mānuṣyai viśa upaharati teno mānuṣīṃ viśamujjayati

They cook the portions in two lots. Of the one lot thereof, after making an 'under-layer' of ghee (clarified butter) in the guhû spoon, he makes two cuttings from each (portion), bastes them once, and replenishes with ghee (the empty places of) the cuttings. Thereupon he makes one cutting from each into the upabhrit spoon, bastes them twice, but does not replenish (the places of) the cuttings. Now, when of the one lot (of portions) he makes two cuttings from each, thereby that (sterile cow) becomes whole; and when he proceeds with those (portions), thereby he wins the divine race. He then presents the (other) half to the human kind: and thereby he wins the human kind (people, vis).