Jewish legend tells us that on the first day of creation God produced ten things: the heavens and the earth, Tohu and Bohu (formlessness and emptiness), light and darkness, wind and water, the duration of the day and the duration of the night.
Several heavens were created, seven in fact, each to serve a distinct purpose. The first, the one visible to us, has no function except that of covering up the light during the night time; therefore it disappears every morning. The planets are fastened to the second of the heavens; in the third the manna is made for the pious in the hereafter; the fourth contains the celestial Jerusalem together with the Temple, in which Michael ministers as high priest, and offers the souls of the pious as sacrifices. In the fifth heaven, the angel hosts reside, and sing the praise of God, though only during the night, for by day it is the task of Israel on earth to give glory to God on high. The sixth heaven is an uncanny spot; there originate most of the trials and visitations ordained for the earth and its inhabitants. Snow lies heaped up there and hail; there are lofts full of noxious dew, magazines stocked with storms, and cellars holding reserves of smoke. Doors of fire separate these celestial chambers, which are under the supervision of the archangel Metatron. Their pernicious contents defiled the heavens until David’s time. The pious king prayed to God to purge His exalted dwelling of whatever was pregnant with evil; it was not becoming that such things should exist near the Merciful One. Only then were they removed to the earth.
The seventh heaven, on the other hand, contains only what is good and beautiful; right, justice, and mercy, the storehouses of life, peace, and blessing, the souls of the pious, the souls and spirits of unborn generations, the dew with which God will revive the dead on the resurrection day, and, above all, the Divine Throne, surrounded by the seraphim and ofanim, the holy Hayyot (the highest angelic beings), and the ministering angels.
(The Legends of the Jews, Ginzberg)