Exodus 26:33

26:33 You are to hang this curtain under the clasps and bring the ark of the testimony in there behind the curtain. The curtain will make a division for you between the Holy Place and the Most Holy Place.

Exodus 28:38

28:38 It will be on Aaron’s forehead, and Aaron will bear the iniquity of the holy things, which the Israelites are to sanctify by all their holy gifts; it will always be on his forehead, for their acceptance before the Lord.