Exodus 14:15-20 New Revised Standard Version (NRSV)
15 Then the Lord said to Moses, “Why do you cry out to me? Tell the Israelites to go forward. 16 But you lift up your staff, and stretch out your hand over the sea and divide it, that the Israelites may go into the sea on dry ground. 17 Then I will harden the hearts of the Egyptians so that they will go in after them; and so I will gain glory for myself over Pharaoh and all his army, his chariots, and his chariot drivers. 18 And the Egyptians shall know that I am the Lord, when I have gained glory for myself over Pharaoh, his chariots, and his chariot drivers.”
19 The angel of God who was going before the Israelite army moved and went behind them; and the pillar of cloud moved from in front of them and took its place behind them. 20 It came between the army of Egypt and the army of Israel. And so the cloud was there with the darkness, and it lit up the night; one did not come near the other all night.