Śatapatha Brāhmaṇa ("of a hundred paths") 11.6.2.9

11.6.2.9

te puruṣamāviśataḥ tasya mukhamevāhavanīyaṃ kurvāte jihvāṃ samidhamannameva śukrāmāhutiṃ te puruṣaṃ tarpayataḥ sa ya evaṃ vidvānaśnātyagnihotramevāsya hutam bhavati te tata utkrāmataḥ

‘They enter man, and make his mouth their offering-fire, his tongue their fuel, and food their pure libation: they satiate man; and, verily, for him who, knowing this, eats food the Agnihotra comes to be offered. They rise upwards from there.