In Exodus 28:37, this signifies the truth of celestial love. (Arcana Coelestia 9933)

In Exodus 26:31, 36, this signifies intelligence from the affection of spiritual love. (Apocalypse Revealed 450) Blue and purple signify celestial goods and truths, and scarlet double-dyed and fine-twined linen signify spiritual goods and truths. (Exodus 28:33)

(Reference: Arcana Coelestia 4922; Ezekiel 27:7)