10. Death of firstborn: Ex. 11:1–12:36
This is what the LORD says: "About midnight I will go throughout Egypt. Every firstborn son in Egypt will die, from the firstborn son of Pharaoh, who sits on the throne, to the firstborn of the slave girl, who is at her hand mill, and all the firstborn of the cattle as well. There will be loud wailing throughout Egypt—worse than there has ever been or ever will be again."
— Exodus 11:4–6
Before this final plague, God commands Moses to tell the Israelites to mark a lamb's blood above their doors in order that the Angel of Death will pass over them (i.e., that they will not be touched by the death of the firstborn). Pharaoh orders the Israelites to leave, taking whatever they want, and asks Moses to bless him in the name of the Lord. The passage goes on to state that the passover sacrifice recalls the time when the LORD "passed over the houses of the Israelites in Egypt