Śatapatha Brāhmaṇa ("of a hundred paths") 3.3.3.4

3.3.3.4

sa āha | candra te vastraṃ te cāgā te dhenuste mithunau te gāvau tisraste 'nyā iti sa yadarvākpaṇante paraḥ sampādayanti tasmādidaṃ sakṛtsarvam paṇyamarvākpaṇante paraḥ sampādayantyatha yadadhvaryureva gorvīryāṇyudācaṣṭe na somasya somavikrayī mahito vai somo devo hi somo 'thatadadhvaryurgām mahayati tasyai paśyanvīryāṇi krīṇāditi tasmādadhvaryureva gorvīryāṇyudācaṣṭe na somasya somavikrayī

He (the Adhvaryu) says, 'Gold is thine, a cloth is thine, a goat is thine, a milch cow is thine, a pair of kine is thine, three other (cows) are thine!' And because they first bargain and afterwards come to terms, therefore about any and everything that is for sale here, people first bargain and afterwards come to terms. And the reason why only the Adhvaryu enumerates the virtues of the cow, and not the Soma-seller those of the Soma, is that Soma is already glorified, since Soma is a god. And the Adhvaryu thereby glorifies the cow, thinking, 'Seeing her virtues he shall buy her!' This is why only the Adhvaryu enumerates the virtues of the cow, and not the Soma-seller those of the Soma.