'Veil' in the Bible

When the camp moves forward, Aaron shall go in, and his sons, and they shall take down the veil of the screen, and cover the ark of the Testimony with it,

You and your sons with you shall keep your priesthood for everything of the altar, and for that within the veil; and you shall serve: I give you the priesthood as a service of gift: and the stranger who comes near shall be put to death."