Brihadaranyaka Upanishad 3.3.2.p1

3.3.2.p1

iti tṛtīyādhyāye tṛtīyaṃ brāhmaṇam

Yājñavalkya said, ‘The Gandharva evidently told you that they went where the performers of the horse sacrifice go.’ ‘And where do the performers of the horse sacrifice go?’ ‘Thirty-two times the space covered by the sun’s chariot in a day makes this world; around it, covering twice the area, is the earth; around the earth, covering twice the area, is the ocean. Now, as is the edge of a razor, or the wing of a fly, so is there just that much opening at the junction (of the two halves of the cosmic shell). (Through that they go out.) Fire, in the form of a falcon, delivered them to the air; the air, putting them in itself, took them where the (previous) performers of the horse sacrifice were.’ Thus did the Gandharva praise the air.footnote{As symbolising the cosmic vital force.} Therefore the air is the diversity of individuals, and the air is the aggregate. He who knows it as such conquers further death. Thereupon Bhujyu, the grandson of Lahya, kept silent.