It is a night of observance to Jehovah, because of their being brought out from the land of Egypt: that same night is an observance to Jehovah for all the children of Israel in their generations.

And Jehovah went before their face by day in a pillar of a cloud, to lead them in the way; and by night in a pillar of fire, to give them light; so that they could go day and night.

And it came between the camp of the Egyptians and the camp of Israel; and was a cloud and darkness, and lit up the night; and the one did not come near the other all the night.

And Moses stretched out his staff over the land of Egypt, and Jehovah brought an east wind on the land all that day and all that night. When it was morning, the east wind brought the locusts.