Śatapatha Brāhmaṇa ("of a hundred paths") 9.4.4.9

9.4.4.9

agnau hutvātha bhakṣayati | daivo vā asyaiṣa ātmā mānuṣo 'yaṃ devā u vā agre 'tha manuṣyāstasmādagnau hutvātha bhakṣayati

Having offered in the fire (or, on the fire-altar), he drinks (Soma), for that (fire-altar) is his (the Sacrificer's) divine body, and this (Sacrificer's real body) is his human one; and the gods indeed were first, and afterwards men: therefore, having offered (Soma) in the fire, he drinks (thereof).