'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.

(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)

In Exodus 12:7, the upper door post signifies almost the same thing as the forehead with a man, i.e., the goods of love, here in the natural man. (Arcana Coelestia 7847)

Upper, in general, signifies the higher or highest degrees of the mind or spirit, and its particular significance depends on the accompanying words. (Conjugial Love 270[5];, Arcana Coelestia 4599)