Śatapatha Brāhmaṇa ("of a hundred paths") 2.2.3.22

2.2.3.22

agnau ha vai devāḥ | sarvāṇi rūpāṇi nidadhire yāni ca grāmyāṇi yāni cāraṇyāni vijayaṃ vopapraiṣyantaḥ kāmacārasya vā kāmāyāyaṃ no gopiṣṭho gopāyaditi vā

And, if they determine upon (offering the second butter-portion to (Agni Pavamâna, let him then say, 'Pronounce the invitatory prayer to Agni Pavamâna;' and he (the Hotri) recites (Rig-veda IX, 16, 19), 'O Agni, thou breathest forth life; produce thou food and sap for us! drive far away misfortune!' For thus, indeed, it becomes of the nature of Agni. Pavamâna (the one that becomes purified) means the Soma; but this (Soma-element) they eliminate from the butter-portion of Soma. For the offering-prayer he recites, 'May Agni Pavamâna graciously accept of the butter!'