Exodus 14:19-22

19The angel of God, who had been going in front of the camp of Israel, moved and went behind them. The pillar of the cloud moved from in front and stood behind them.

20So it came between the camp of Egypt and the camp of Israel. It was a cloud along with darkness [even by day to the Egyptians], but it gave light by night [to the Israelites]; so one [army] did not come near the other all night.

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

22The Israelites went into the middle of the sea on dry land, and the waters formed a wall to them on their right hand and on their left.