Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 16.8.37

16.8.37

agnāviṣṇū vai devānām anta bhājau /

connected with Viṣṇu and Varuṇa; whatever mistake or error there is in the sacrifice, that with this he remedies; verily this is medicine. He recites (a verse) to Viṣṇu and (a verse) to Agni; of the gods Agni and Viṣṇu are those whose portions are at the end; therefore these he recites in the end Çastra. He concludes with (a verse) to Indra, for he is Indra's; verily him Indra at the end establishes.