In Exodus 26:1, this signifies interior truths of faith understood with a new mind. (Arcana Coelestia 9595)

In Exodus 26:7, this signifies the outermost of innocent ignorance that was found among some of the gentiles. (Arcana Coelestia 3519[8])

In Numbers 4:25, this signifies the Word in its literal sense. (Doctrine Regarding Sacred Scripture 42)

In Jeremiah 10:20, this signifies truths that come from good and serve as a covering of the good. (Apocalypse Explained 799[11])

(Odkazy: Exodus 26; Jeremiah 4:20)

'Thirty' has a twofold significance because it is is the product of five and six, and also three and ten. From five multiplied by six, it signifies some aspect of combat, because 'five' signifies some part or aspect, and 'six,' combat. From three multiplied by ten, it signifies something full of remains of good and truth, because 'three' signifies fullness, and 'ten,' remains of good and truth. A composite number involves the same as the simple numbers it has as its factors.

(Odkazy: 2 Samuel 5:4; Arcana Coelestia 5335; Luke 3, 3:23, 23; Numbers 4:3, 4:23, 4:30)