Exodus 28:31 KJV
And thou shalt make the robe of the ephod all of blue.
Exodus 28:31, King James Version
In context
30 And thou shalt put in the breastplate of judgment the Urim and the Thummim; and they shall be upon Aaron’s heart, when he goeth in before the Lord: and Aaron shall bear the judgment of the children of Israel upon his heart before the Lord continually.
31 And thou shalt make the robe of the ephod all of blue.
32 And there shall be an hole in the top of it, in the midst thereof: it shall have a binding of woven work round about the hole of it, as it were the hole of an habergeon, that it be not rent.