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20 And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl that may fly above the earth in the open firmament of heaven.
'A sandal tree' signifies aspects of the natural self.
(Referencias: Apocalypse Explained 518)
18 Now what have you to do in the way to Egypt, to drink the waters of the Shihor? Or what have you to do in the way to Assyria, to drink the waters of the River?