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23 And with him was Aholiab, son of Ahisamach, of the tribe of Dan, an engraver, and a cunning workman, and an embroiderer in blue, and in purple, and in scarlet, and fine linen.
In Psalm 84:2, this signifies the lower heavens. (Apocalypse Explained 391[11])
Four hundred signifies vastation, temptations, and how long these will last.
(Odkazy: Arcana Coelestia 2959)