Exodus 14:20

20and stood between the camp of the Egyptians and the camp of Israel. And it was a dark cloud, yet it illuminated the night, so that they could not succeed at approaching one another at any time all that night.
14:20 A dark cloud, and enlightening the night: It was a dark cloud to the Egyptians; but enlightened the night to the Israelites by giving them a great light.(Challoner)

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