The Cosmic Being

"A thousand heads hath Purusha, a thousand eyes, a thousand feet;
On every side pervading, he fills a space ten fingers wide.
This Purusha is all that yet hath been and all that is to be;
The Lord of Immortality which waxes greater still by food.

So mighty is His greatness; yea, greater than this is Purusha.

All creatures are one-fourth of Him, three-fourths eternal life in heaven.

With three-quarters Purusha went up: one-quarter of Him again was here.
...

When they divided Puruṣa how many portions did they make?

What do they call his mouth, his arms? What do they call his thighs and feet?

 The Brahman was his mouth, of both his arms was the Rājanya made.

His thighs became the Vaiśya, from his feet the Śūdra was produced.

The Moon was gendered from his mind, and from his eye the Sun had birth;

Indra and Agni from his mouth were born, and Vāyu from his breath.
 Forth from his navel came mid-air the sky was fashioned from his head

Earth from his feet, and from his car the regions. Thus they formed the worlds,"

- Rg Veda 10.90 - Purusha Sukta (~ 1500 - 1000 BCE)