Chandogya Upanishad
Prapathaka V, Khanda 18
Then he said to them all: 'You eat your food, knowing that Vaisvânara Self as if it were many. But he who worships the Vaisvânara Self as a span long, and as identical with himself, he eats food in all worlds, in all beings, in all Selfs.
'Of that Vaisvânara Self the head is Sutegas (having good light), the eye Visvarûpa (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 Gârhapatya fire, the mind the Anvâhârya fire, the mouth the Âhavanîya fire.