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. May bear the iniquity of the holy things - ונשא אהרן את עון הקדשים venasa Aharon eth avon hakkodashim. And Aaron shall bear (in a vicarious and typical manner) the sin of the holy or separated things - offerings or sacrifices. Aaron was, as the high priest of the Jews, the type or representative of our blessed Redeemer; and as he offered the sacrifices prescribed by the law to make an atonement for sin, and was thereby represented as bearing their sins because he was bound to make an atonement for them; so Christ is represented as bearing their sins, i.e., the punishment due to the sins of the world, in his becoming a sacrifice for the human race. See Isaiah 53:4, Isaiah 53:12, where the same verb, נשא nasa, is used; and see 1 Peter 2:24. By the inscription on the plate on his forehead Aaron was acknowledged as the holy minister of the holy God. To the people's services and their offerings much imperfection was attached, and therefore Aaron was represented, not only as making an atonement in general for the sins of the people by the sacrifices they brought, but also as making an atonement for the imperfection of the atonement itself, and the manner in which it was brought.
It shall be always upon his forehead - The plate inscribed with Holiness to the Lord should be always on his forehead, to teach that the law required holiness; that this was its aim, design, and end: and the same is required by the Gospel; for under this dispensation it is expressly said, Without holiness no man shall see the Lord; Hebrews 12:14.