This is the Jewish visionary text of the Hekhaloth school originating from the Talmudic phase of Jewish mysticism during the first century AD. The Hekhaloth were different “chambers” or “halls” through which mystics advanced during meditation.
Alone this meditative journey the divine names of God would be repeated in a Mantra while the mystics would project their consciousnesses into spirit-vehicles which journey to each hall in turn. In each of the chamber a sacred “seal” was presented to an archangel who guarded that chamber.
Just before reaching the seventh chamber, the mystics would enter a chariot that would lift each of them up to a profound state of mystical ecstasy, an experience called Merkabah. A.G.H.