Exodus 14:19-22

19And the angel1 of God, who had gone before the camp of Israel, withdrew and went behind them. The pillar of cloud also moved from before them and stood behind them, 20so that it came between the camps of Egypt and Israel. The cloud was there in the darkness, but it lit up the night.2 So all night long neither camp went near the other.

21Then Moses stretched out his hand over the sea, and all that night the LORD drove back the sea with a strong east wind that turned it into dry land. So the waters were divided, 22and the Israelites went through the sea on dry ground, with walls of water on their right and on their left.