Priests: Services of Keeping the Charge of the Tabernacle
Source: TTT
Numbers 18:1, 5, 7
So the LORD said to Aaron, “You and your sons and your father’s house must bear the iniquity involving the sanctuary. And you and your sons alone must bear the iniquity involving your priesthood. / And you shall attend to the duties of the sanctuary and of the altar, so that wrath may not fall on the Israelites again. / But only you and your sons shall attend to your priesthood for everything concerning the altar and what is inside the veil, and you are to perform that service. I am giving you the work of the priesthood as a gift, but any outsider who comes near the sanctuary must be put to death.”