A voice came from the midst of the fire. "Abraham, Abraham!"
"Here I am."
"Consider the expanses beneath the firmament on which you are now placed, and see that on no single expanse is there any other but He whom you have sought, the One who has loved you."
While God was still speaking, the expanses opened beneath Abraham's feet, and the heavens unfolded below him.
He stood upon the seventh firmament and saw a fire widely extended, and light, and dew, and a multitude of angels, and a power of invisible glory hovering over the living creatures. But no other being was there. Only God's presence, alone and absolute.
He looked downward to the sixth firmament and saw a multitude of pure spirits without bodies, carrying out the commands of the fiery angels on the firmament above. These were the ministering angels, bodiless servants executing heaven's will.
God commanded the sixth firmament to be removed. Beneath it, on the fifth firmament, Abraham saw the powers of the stars carrying out their appointed commands, and the elements of the earth obeying them.
Layer by layer, the architecture of creation was being peeled back for Abraham to see. Seven heavens stacked like veils over the earth, each one populated by its own order of beings, each one governed by the one above it, and all of them answering ultimately to the voice from the fire.
The tradition records what dwells in each heaven. The seventh contains judgment, righteousness, the treasures of life, peace, and blessing, the souls of the departed righteous, the spirits and souls yet unborn, the dew with which God will awaken the dead, and God Himself on the Throne of Glory. Abraham was seeing it all from the top down.