Zohar, Bereshit 34

1R. Simeon explained the difference, and said: ‘It is written, “Close by the border shall the rings be, for places for the staves” (Ex. 25, 27). The “border” is a secret place accessible only by one narrow path known to a few. It is, therefore, filled with gates and lit with lamps. This is the future world, which, being hidden and stored away, is called misgereth (border, lit. closed).

2The “rings” are the supernal chain of water, air, and fire, which are linked with one another and emerge from one another like so many rings of a chain. They all turn to the “border”, with which is connected that supernal stream which waters them, and with which they are thus connected.

3Further, these supernal rings are “places for the staves”, to wit, the lower chariots, of which some are from the side of fire, some of water, and some of air, so that they should be a chariot to the ark. Hence anyone who approaches should proceed only as far as the staves, but should not penetrate further, save those who are qualified to minister within, and to whom permission has been given to enter for that purpose.’