You can spare the life of a first-born donkey by sacrificing a lamb; if you don't, you must break the donkey's neck. You must spare every first-born son.
The king stubbornly refused to set us free, so the Lord killed the first-born male of every animal and the first-born son of every Egyptian family. This is why we sacrifice to the Lord every first-born male of every animal and save every first-born son.”