Exodus 28:36-38

³⁶And thou shalt make a plate of pure gold, and grave upon it, like the engravings of a signet, HOLY TO JEHOVAH. ³⁷And thou shalt put it on a lace of blue, and it shall be upon the mitre; upon the forefront of the mitre it shall be. ³⁸And it shall be upon Aaron`s forehead, and Aaron shall bear the iniquity of the holy things, which the children of Israel shall hallow in all their holy gifts; and it shall be always upon his forehead, that they may be accepted before Jehovah.