Arcana Coelestia#1218
1218. That 'Shem' here means the Ancient Church in general becomes clear from the fact that here the subject is Eber who is considered next, and from the fact that in this verse he is called 'Japheth's elder brother'.
Genesis第10章:10
10
The beginning of his kingdom was Babel, Erech, Accad, and Calneh, in the land of Shinar.