Exodus 39:29-31

Young's Literal Translation

²⁹ and the girdle of twined linen, and blue, and purple, and scarlet, work of an embroiderer, as Jehovah hath commanded Moses.

³⁰ And they make the flower of the holy crown of pure gold, and write on it a writing, openings of a signet, `Holy to Jehovah;'

³¹ and they put on it a ribbon of blue, to put [it] on the mitre above, as Jehovah hath commanded Moses.