Exodus 11-13
It is very important to note that God executes the eldest son of Egypt due to the fact that He refers to Israel as His son. It is also important to note that the preservation of the eldest son in Israel was only through the blood of the Passover Lamb.
The Passover Lamb was the continuation of Genesis 3:15, the sacrifice of the ultimate New Adam for the nation and the world. Without this sacrifice there was no deliverance. While the nation was clearly sinners, yet anyone who put the blood on the doorpost had all of his family saved from the plague if they were gathered into his home.
Yet just as God provided the coats of skins as an illustration of Gen. 3:15, so also now God provides the revelation of the Passover Lamb. It would be this Lamb that would deliver them from bondage in Egypt. Yet little lambs cannot physically deliver, and thus the reader is immediately aware that God is delivering through this symbol. This is not the final ultimate deliverance from oppression of Satan. It is yet to come in a man, the Seed of the Woman.
Dr. Charles Baylis
Video
Chapters 12-13
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Commentary
Links & Sources
TeachMeTheBible.com - Dr. David Klingler
The Spring Church Sermons - Prof Caleb Foley
Traceway Church Sermons - Dr. Nathan Tullos
TheBiblicalStory.org - Dr. Charles Baylis