Śatapatha Brāhmaṇa ("of a hundred paths") 2.6.1.33

2.6.1.33

taddhaike | etameva hotre manthamādadhati taṃ hotopahūyāvaiva jighrati taṃ brahmaṇe prayacati tam brahmāvaiva jighrati tamagnīdhe prayacati tamagnīdavaiva jighratyetannvevaitatkurvanti yathā tvevetarasya yajñasyeḍāprāśitraṃ samavadyantyevamevaitasyāpi samavadyeyustāmupahūyāvaiva jighranti na prāśnanti prāśitavya tveva vayam manyāmaha iti ha smāhāsuriryasya kasya cāgnau juhvatīti

Here now some hand over that entire (remaining) porridge to the Hotri; and the Hotri, having invoked it, smells it and hands it to the Brahman. The Brahman smells it and hands it to the Âgnîdhra; and the Âgnîdhra also smells it. And so indeed they do this. But, as from any other oblation they cut off the Ida and the fore-portion, so let them cut from this also; and having invoked it (the Idâ) they smell it, but do not eat it. 'But,' said Âsuri, 'we think that some should be eaten, of whatever is offered up in the fire.'