Śatapatha Brāhmaṇa ("of a hundred paths") 1.9.2.33

1.9.2.33

sa ninayati | kastvā vimuñcati sa tvā vimuñcati kasmai tvā vimuñcati tasmai tvā vimuñcati poṣāyeti tatpuṣṭimuttamāṃ yajamānāyā nirāha sa yenaiva praṇayati tena ninayati yena hyeva yogyaṃ yuñjanti tena vimuñcanti yoktreṇa hi yogyaṃ yuñjanti yoktreṇa vimuñcantyatha phalīkaraṇāṅkapālenādho 'dhaḥ kṛṣṇājinamupāsyati rakṣasām bhāgo 'sīti

He pours it out, with the text (Vâg. S. II, 23 a), 'Who unyokes thee? He unyokes thee! For whom does he unyoke thee? For him he unyokes thee! For plenty!' He thereby announces to the sacrificer the highest prosperity. He pours it out with the same (vessel) with which he brings it forward; for wherewith they yoke the team, therewith they also unyoke it; with the yoke-tie they yoke it, and with the yoke-tie they unyoke it. By means of a potsherd he now throws the refuse from the cleaning of the rice right under the black antelope skin; with the text (Vâg. S. II, 23 b), 'The Rakshas' share art thou!'