Exodus 28:37

35It shall be on Aaron to minister: and its sound shall be heard when he goes in to the holy place before the LORD, and when he comes out, that he not die.

36“You shall make a plate of pure gold, and engrave on it, like the engravings of a signet, ‘HOLY TO THE LORD.’

37You shall put it on a lace of blue, and it shall be on the sash. It shall be on the front of the sash.

38It shall be on Aaron’s forehead, and Aaron shall bear the iniquity of the holy things, which the children of Israel shall make holy in all their holy gifts; and it shall be always on his forehead, that they may be accepted before the LORD.

39You shall weave the tunic with fine linen. You shall make a turban of fine linen. You shall make a sash, the work of the embroiderer.