Exodus 28:31
"You shall make the robe of the ephod all of blue.
Exodus 28:4
These are the garments which they shall make: a breastplate, and an ephod, and a robe, and a coat of checker work, a turban, and a sash: and they shall make holy garments for Aaron your brother, and his sons, that he may minister to me in the priest's office.
Exodus 28:28
They shall bind the breastplate by its rings to the rings of the ephod with a lace of blue, that it may be on the skillfully woven band of the ephod, and that the breastplate may not swing out from the ephod.
Exodus 39:22-26
He made the robe of the ephod of woven work, all of blue.
Leviticus 8:7
He put the coat on him, tied the sash on him, clothed him with the robe, put the ephod on him, and he tied the skillfully woven band of the ephod on him, and fastened it to him with it.