Exodus 28:36-38
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36"You shall make a plate of pure gold, and engrave on it, like the engravings of a signet, `HOLY TO YAHWEH.` 37You shall put it on a lace of blue, and it shall be on the sash; on the front of the sash it shall be. 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 Yahweh.
Exodus 28:36-38 (WEB)