Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 7.10.2

7.10.2

yāḥ prāyṇīyāyām puronuvākyās tā udayanīyāyām yājyāḥ karoti /

those that are invitatory verses in the introductory [sacrifice], he makes offering verses in the concluding [sacrifice];