Exodus 14:5, 9

Now it was told the king of Egypt that the people had fled, and the heart of Pharaoh and his servants was turned against the people; and they said, “Why have we done this, that we have let Israel go from serving us?”

So the Egyptians pursued them, all the horses and chariots of Pharaoh, his horsemen and his army, and overtook them camping by the sea beside Pi Hahiroth, before Baal Zephon.