Shatapatha Brahmana 2.5.3.2

2.5.3.2

sa pūrvedyuḥ | agnaye 'nīkavate 'ṣṭākapālaṃ puroḍāśaṃ nirvapatyagniṃ ha vai devā anīkaṃ kṛtvopapreyurvṛtraṃ haniṣyantaḥ sa tejo 'gnirnāvyathata tatho evaiṣa etatpāpmānaṃ dviṣantam bhrātṛvyaṃ haniṣyannagnimevānīkaṃ kṛtvopapraiti sa tejo 'gnirna vyathate tasmādagnaye 'nīkavate

On the first day he offers a cake on eight potsherds to Agni Anîkavat. For it was after shaping Agni into a sharp point, that the gods rushed forward, intent on slaying Vritra; and that sharp point, Agni, swerved not. And so does he (the Sacrificer) now rush forward, after shaping Agni into a sharp point, intent on slaying his wicked, spiteful enemy; and that sharp point, Agni, swerves not: this is why he sacrifices to Agni Anîkavat.