Preaching on Exodus 12 this Sunday as the first in a series on penal substitution in the OT (contra Steve Chalke et al.).
How beautiful the justice of the Passover is.
In Exodus 1:16, the Egyptians have sought the death of every son born to Israel.
In 4:22, we discover that the Israel Pharaoh has been oppressing is God's "firstborn son". We also have a forewarning of the Passover in 4:23.
In the Passover, every house in Egypt loses its firstborn son, while the firstborn sons of the firstborn son (Israel) are delivered by God's provision of a blood substitute.
Notice the mercy as well. In retribution for 1:16, God could quite fairly have killed every son of Egypt. He chose only to kill the firstborn.
What a just and merciful God we serve!