Alright, so in Exodus 10, the Lord sends a plague of locusts to attack Egypt. Pharaoh's magicians tried to counter the plague, but failed. Pharaoh finally gives in and agrees to let the Israelites go. The Lord then sends a thick darkness to the land of Egypt and Pharaoh calls for Moses and tells him to take the people and go. Moses then warns Pharaoh that if he changes his mind, the Lord will punish him, and Pharaoh agrees. And that's the story of Exodus 10!