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4 And God saw the light, that it was good: and God divided the light from the darkness.
'A sandal tree' signifies aspects of the natural self.
(References: Apocalypse Explained 518)
6 Behold, I will stand before you there on the rock in Horeb. You shall strike the rock, and water will come out of it, that the people may drink." Moses did so in the sight of the elders of Israel.