Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.5.13

4.4.5.13

agnerha vai devāḥ | yāvadvā yāvadvāpsu praveśayāṃ cakrurnedato nāṣṭrā rakṣāṃsyupottiṣṭhānityagnirhi rakṣasāmapahantā tametayā ca samidhaitayā cāhutyā saminddhe samiddhe devebhyo juhavānīti

Now, once on a time, the gods made so much of Agni, as would go in, enter the water, in order that the evil spirits should not rise therefrom; for Agni is the repeller of evil spirits. It is him he kindles by this kindling-stick and by this oblation, thinking 'On the kindled (fire) will I offer to the gods!'