Śatapatha Brāhmaṇa ("of a hundred paths") 1.4.2.13

1.4.2.13

āspātraṃ juhūrdevānāmiti | devapātraṃ vā eṣa yadagnistasmādagnau sarvebhyo devebhyo juhvati devapātraṃ hyeṣa prāpnoti ha vai tasya pātraṃ yasya pātram prepsyati ya evametadveda

Further, 'The mouth-vessel, the offering-spoon of the gods;' for he, Agni, is indeed the vessel of the gods: therefore they make offerings in Agni to all the gods, he being the vessel of the gods. And, verily, whosoever knows this, obtains the vessel of him whose vessel he desires to obtain.