Śatapatha Brāhmaṇa ("of a hundred paths") 8.7.2.8

8.7.2.8

sa vai yajuṣmatīrupadhāya | lokampṛṇayā pracādayatyannaṃ vai yajuṣmatya iṣṭakā ātmā lokampṛṇānnaṃ tadātmanā paridadhāti tasmādannamātmanā parihitamātmaiva bhavati

Having laid down those (bricks) possessed of (special) sacrificial formulas, he covers (the altar) with the Lokamprinâ; for the bricks possessed of formulas mean food, and the Lokamprinâ means the body: he thus encloses the food in the body, whence food enclosed in the body is the body itself.