Exodus 28:31
And thou shalt make the robe of the ephod all of blue.
Exodus 28:4
And these are the garments which they shall make: a breastplate, and an ephod, and a robe, and a coat of checker work, a mitre, and a girdle: and they shall make holy garments for Aaron thy brother, and his sons, that he may minister unto me in the priest's office.
Exodus 28:28
And they shall bind the breastplate by the rings thereof unto the rings of the ephod with a lace of blue, that it may be upon the skilfully woven band of the ephod, and that the breastplate be not loosed from the ephod.
Exodus 39:22-26
And he made the robe of the ephod of woven work, all of blue.
Leviticus 8:7
And he put upon him the coat, and girded him with the girdle, and clothed him with the robe, and put the ephod upon him, and he girded him with the skilfully woven band of the ephod, and bound it unto him therewith.