TSK
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They shall be on Aaron, and on his sons, when they go in to the Tent of Meeting, or when they come near to the altar to minister in the holy place; that they don't bear iniquity, and die: it shall be a statute forever to him and to his descendants after him.
"'They shall therefore follow my requirements, lest they bear sin for it, and die therein, if they profane it. I am Yahweh who sanctifies them.
You shall appoint Aaron and his sons, and they shall keep their priesthood. The stranger who comes near shall be put to death."
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."