Śatapatha Brāhmaṇa ("of a hundred paths") 13.4.3.7

13.4.3.7

atha tṛtīye'han evamevaitāsviṣṭiṣu saṃsthitāsveṣaivāvṛdadhvaryaviti havai hotarityevādhvaryurvaruṇa ādityo rājetyāha tasya gandharvā viśasta ima āsata iti yuvānaḥ śobhanā upasametā bhavanti tānupadiśatyatharvāṇo vedaḥ so'yamityatharvaṇāmekam parva vyācakṣāṇa ivānudravedevamevādhvaryuḥ sampreṣyati na prakramānjuhoti

And on the third day, after those (three) offerings have been performed in the same way, there is that same course of procedure. 'Adhvaryu!' he (the Hotri) says.--'Havai hotar!' replies the Adhvaryu.--'King Varuna Âditya,' he says; 'his people are the Gandharvas, and they are staying here;'--handsome youths have come thither: it is these he instructs;--'The Atharvans are the Veda: this it is;' thus saying, let him go over one section (parvan) of the Atharvan, as if reciting it. The Adhvaryu calls in the same way (on the masters of lute-players), but does not perform the Prakrama oblations.