Atharva Veda 1.32: In praise of Heaven and Earth

Ye people, hear and mark this well: he will pronounce a mighty prayer: That which gives breathing to the Plants is not on earth nor in, the heaven.

Their station, as of those who rest when weary, is in midmost air: The base whereon this world is built, the sages know or know it not.

What the two trembling hemispheres and ground produced and fashioned forth.
This All, is ever fresh to-day, even as the currents of the sea.

This All hath compassed round the one, and on the other lies at rest.
To Earth and all-possessing Heaven mine adoration have I paid.