Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 10.8.7

10.8.7

etā ha vā u teṣām puronuvākyā etā yājyāḥ / (paśu: stoka anuvacana)

x. 5. Then he recites (the verses) accompanying the drops; verily with them he makes the drops suitable for Agni. These are the invitatory verses for them, these the offering verses. Therefore they are appropriate. Having proceeded with the (offering to the) calls of Hail! they proceed with the (offering of the) omentum; verily thus they make the fore-offerings sharers in the victim. He should not utter speech between the (offering to the) calls of Hail! and the (offering of the) omentum,