Exodus 28:28
They are to tie the breastpiece by its rings to the rings of the ephod by blue cord, so that it may be above the waistband of the ephod, and so that the breastpiece will not be loose from the ephod.
Numbers 15:38
"Speak to the Israelites and tell them to make tassels for themselves on the corners of their garments throughout their generations, and put a blue thread on the tassel of the corners.
Exodus 28:31
"You are to make the robe of the ephod completely blue.
Exodus 28:37
You are to attach to it a blue cord so that it will be on the turban; it is to be on the front of the turban,
Exodus 39:30-31
They made a plate, the holy diadem, of pure gold and wrote on it an inscription, as on the engravings of a seal, "Holiness to the Lord."