Khandogya-Upanishad: Fifth Prapathaka, Eighteenth Khanda
1. Then he said to them all: “You eat your food, knowing that Vaisvanara Self as if it were many. But he who worships the Vaisvanara Self as a span long, and as identical with himself, he eats food in all worlds, in all beings, in all Selfs.
2. “Of that Vaisvanara Self the head is Sutegas (having good light), the eye Visvariupa (multiform), the breath Prithagvartman (having various courses), the trunk Bahula (full), the bladder Rayi (wealth), the feet the earth, the chest the altar, the hairs the grass on the altar, the heart the Garhapatya fire, the mind the Anvaharya fire, the mouth the Ahavaniya fire.