The ninth plague was darkness. Day became night and no one in Egypt could see anything. They became very scared. But in Goshen, where the Israelites lived, there was light. The tenth plague was the most horrible of all. The firstborn son in every Egyptian family died. Even Pharaoh's son died. But the Hebrew were protected because they made a sacrifice called a "pesach" to God and painted the blood of the lambs they sacrificed on the doorposts of their homes.