God offers the model for humanity’s hope.
The blood will be a sign for you on the houses where you are; and when I see the blood, I will pass over you. No destructive plague will touch you when I strike Egypt.
The exodus of the Jews from Egypt was one of many great events in their long history. They had lived in Egypt for 430 years. All went well at first under the leadership of the Pharaoh and through the influence of Joseph. Joseph died, and 200 years later a new Pharaoh came to the throne. He “did not know about Joseph” (Ex 1:8). Startling changes were made. The Egyptians in a cruel and degrading bondage enslaved the Jews. God had to deal severely with Pharaoh before he would let God’s people go. The tenth and culminating plague was God’s provision to secure His children’s release. It changed the course of human history.
— Wesley Bible Curriculum, January 6, page 38