Arcana Coelestia # 8087
8087. 'From the firstborn of man even to the firstborn of beast' means the falsity, interior and exterior, belonging to separated faith. This is clear from the meaning of 'the firstborn of Egypt' as faith separated from charity, as immediately above in 8086, and so falsity belonging to faith, for those who separate faith from charity both in doctrine and in life are inescapably subject to falsity since the evil that pervades their life is constantly active, pressing falsity into agreement with itself (or if truth presents itself that evil then misapplies it and thereby brings it into agreement with itself, thus falsifies it); and from the meaning of 'man and beast' as what is interior and what is exterior, dealt with in 4724, 7523.
Arcana Coelestia # 8086
8086. 'That Jehovah killed all the firstborn in the land of Egypt' means that all governed by faith separated from charity were damned. This is clear from the meaning of 'the firstborn of Egypt' as faith separated from charity, dealt with in 7039, 7797; as for the death of the firstborn, that it means the damnation of those who are governed by that faith and lead a life of evil, see 7766, 7778.