What's the 10th Plague?

Moses is called God's first born son in the book of Exodus. He and his sons are thrown into the Nile by an edict by Pharaoh back in chapter one. There's no true payback until the 10th plague, when Egypt kills Moses. This is really the principle of an eye for an eye and tooth for tooth. You do this and this is what will happen to you. It's justice by retribution.