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Chandogya Upanishad 5.18.2

'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.

In plain words: The king describes the universal Self as one body. Heaven is its head, the sun its eye, air its breath, space its trunk, water its bladder, and earth its feet. Its chest, hair, heart, mind and mouth are the altar, the altar grass, and the three sacred fires.

Chandogya Upanishad
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