Exodus 13:15-22

and it came to pass, when Pharaoh would hardly let us go, that Jehovah slew all the first-born in the land of Egypt, both the first-born of man, and the first-born of beast: therefore I sacrifice to Jehovah all that openeth the womb, being males; but all the first-born of my sons I redeem. And it shall be for a sign upon thy hand, and for frontlets between thine eyes: for by strength of hand Jehovah brought us forth out of Egypt. And it came to pass, when Pharaoh had let the people go, that God led them not by the way of the land of the Philistines, although that was near; for God said, Lest peradventure the people repent when they see war, and they return to Egypt: but God led the people about, by the way of the wilderness by the Red Sea: and the children of Israel went up armed out of the land of Egypt. And Moses took the bones of Joseph with him: for he had straitly sworn the children of Israel, saying, God will surely visit you; and ye shall carry up my bones away hence with you. And they took their journey from Succoth, and encamped in Etham, in the edge of the wilderness. And Jehovah went before them by day in a pillar of cloud, to lead them the way, and by night in a pillar of fire, to give them light; that they might go by day and by night: the pillar of cloud by day, and the pillar of fire by night, departed not from before the people.