Read Exodus 28:38 Using Other Translations
And it shall be upon Aaron's forehead, that Aaron may 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 the LORD.
It shall be on Aaron's forehead, and Aaron shall bear any guilt from the holy things that the people of Israel consecrate as their holy gifts. It shall regularly be on his forehead, that they may be accepted before the LORD.
Aaron must wear it on his forehead so he may take on himself any guilt of the people of Israel when they consecrate their sacred offerings. He must always wear it on his forehead so the LORD will accept the people.