Exodus 14:19-22

19Then the angel of God, who went before the camp of Israel, moved and went behind them. Also the pillar of cloud moved from in front and stood behind them,

20and so came between the camp of Egypt and the camp of Israel—there was the cloud and the darkness over here, yet it gave light by night over there—neither one came near the other all night long.

21Then Moses stretched out his hand over the sea. Adonai drove the sea back with a strong east wind throughout the night and turned the sea into dry land. So the waters were divided.

22Then Bnei-Yisrael went into the midst of the sea on the dry ground, while the waters were like walls to them on their right and on their left.