In Exodus 26:26, this signifies the power of truth from good, as found in the good of merit, which is the Lord's alone. (Arcana Coelestia 9662)

In Exodus 26:28, this signifies the power of truth looking toward the interiors which are in light and also to the exteriors where truth is obscure. (Arcana Coelestia 9663, 9664)

In Exodus 26:29, this signifies the primary power of good from which all other powers are extended. (Arcana Coelestia 9666)

Bars, as in Lamentations 2:9, signify doctrinal teachings.

(Odkazy: Arcana Coelestia 402)

9662. 'And you shall make bars from shittim wood' means the power of the truth springing from good. This is clear from the meaning of 'bars' or 'poles' as the power which truth from good possesses, dealt with in 9496; and from the meaning of 'shittim wood' as the good of merit, which is the Lord's alone, dealt with in 9472, 9486, this good being the one and only good that reigns in heaven, see 9486, and therefore the source of the power that truths possess.