Exodus 14:19-22

19And the Angel of God, who went before the camp of Israel, moved and went behind them; and the pillar of cloud went from before them and stood behind them.

20So it came between the camp of the Egyptians and the camp of Israel. Thus it was a cloud and darkness to the one, and it gave light by night to the other, so that the one did not come near the other all that night.

21Then Moses stretched out his hand over the sea; and the Lord caused the sea to go back by a strong east wind all that night, and made the sea into dry land, and the waters were divided.

22So the children of Israel went into the midst of the sea on the dry ground, and the waters were a wall to them on their right hand and on their left.