Śatapatha Brāhmaṇa ("of a hundred paths") 13.4.3.14

13.4.3.14

atha daśame'han evamevaitāsviṣṭiṣu saṃsthitāsveṣaivāvṛdadhvaryaviti havai hotarityevādhvaryurdharma indro rājetyāha tasya devā viśasta ima āsata iti śrotriyā apratigrāhakā upasametā bhavanti tānupadiśati sāmāni vedaḥ so'yamiti sāmnāṃ daśatam brūyādevamevādhvaryuḥ sampreṣyati na prakramānjuhotīti

And on the tenth day, after those (three) offerings have been performed in the same way, there is the same course of procedure. 'Adhvaryu!' he (the Hotri) says.--'Havai hotar!' replies the Adhvaryu.--'King Dharma Indra,' he says, 'his people are the Gods, and they are staying here;'--learned srotriyas (theologians), accepting no gifts, have come thither: it is these he instructs; 'the Sâman (chant-texts) are the Veda: this it is;' thus saying, let him repeat a decade of the Sâman. The Adhvaryu calls in the same way (on the masters of lute-players), but does not perform the Prakrama oblations.