Exodus 28:37

And thou shalt put it on the spun blue cloth, and it shall be on the mitre: it shall be in the front of the mitre.

And you shall put them on Aaron your brother, and his sons with him, and you shall anoint them and fill their hands: and you shall sanctify them, that they may minister to me in the priest's office.

And thou shalt put it on a blue lace, that it may be upon the mitre; upon the forefront of the mitre it shall be.