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7 And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.
'A sandal tree' signifies aspects of the natural self.
(Referencias: Apocalypse Explained 518)
8 It will sweep onward into Judah. It will overflow and pass through; it will reach even to the neck; and the stretching out of its wings will fill the breadth of your land, Immanuel.