'Blue' in the Bible

Clothed with blue -- governors and prefects, Desirable young men all of them, Horsemen, riding on horses,

Of fine linen with embroidery from Egypt hath been thy sail, To be to thee for an ensign, Of blue and purple from isles of Elishah hath been thy covering.

They are thy merchants for perfect things, For wrappings of blue, and embroidery, And for treasuries of rich apparel, With cords bound and girded, for thy merchandise,