Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 14.5.8

14.5.8

tad etat pavamāna uktham eva yat praugam / (soma: prātaḥ savana)

recites) the Praüga. The Praüga is the hymn of the Pavamāna; the Ājya is the hymn of the Ājya. Thus he transposes the two; it is as if one were to intertwine the outer reins of a chariot. 'Thus he accompanies the cups', Kauṣītaki used to say; yonder cup for Vāyu and Indra and Vāyu (he accompanies) by that (recitation) for Vāyu and for Indra and Vāyu; that for Mitra and Varuṇa with that for Mitra and Varuṇa; that for the Açvins with that for the Açvins; in that he utters the offering verses for the Prasthitas, that (he accompanies) with that for Indra; in that the Hotrakas sacrifice together, that with that for the All-gods. Sarasvatī is speech in all the pressings. He yonder who makes heat is the Puroruc, for he shines in front; again breath is the Puroruc, while the hymn is the body; the body is the Puroruc and the hymn is cattle and offspring; therefore he should not utter any call between the Puroruc and the hymn. Reciting the hymn with the Puroruc, he calls aloud for each Puroruc; 'Vāyu, proceeding in front' is the symbol of expiration; 'O Vāyu' is the symbol of inspiration. He recites the Praüga as Gāyatrī; thereby the morning pressing is obtained; (he recites it) as addressed to Indra; thereby the midday pressing is obtained; (he recites it) as addressed to the All-gods; thereby the third pressing is obtained.