Numbers 18:3
They shall keep your commands, and the duty of all the Tent: only they shall not come near to the vessels of the sanctuary and to the altar, that they not die, neither they, nor you.
Numbers 4:15
"When Aaron and his sons have finished covering the sanctuary, and all the furniture of the sanctuary, as the camp moves forward; after that, the sons of Kohath shall come to carry it: but they shall not touch the sanctuary, lest they die. These things are the burden of the sons of Kohath in the Tent of Meeting.
Numbers 3:25
The duty of the sons of Gershon in the Tent of Meeting shall be the tabernacle, and the tent, its covering, and the screen for the door of the Tent of Meeting,
Numbers 3:31
Their duty shall be the ark, the table, the lamp stand, the altars, the vessels of the sanctuary with which they minister, and the screen, and all its service.
Numbers 3:36
The appointed duty of the sons of Merari shall be the tabernacle's boards, its bars, its pillars, its sockets, all its instruments, all its service,
Numbers 4:19-20
but thus do to them, that they may live, and not die, when they approach to the most holy things: Aaron and his sons shall go in, and appoint them everyone to his service and to his burden;
Numbers 16:40
to be a memorial to the children of Israel, to the end that no stranger, who isn't of the seed of Aaron, comes near to burn incense before the LORD; that he not be as Korah, and as his company: as the LORD spoke to him by Moses.
Numbers 1:51
When the tabernacle is to move, the Levites shall take it down; and when the tabernacle is to be set up, the Levites shall set it up. The stranger who comes near shall be put to death.
Numbers 18:7
You and your sons with you shall keep your priesthood for everything concerning the altar, and for that inside 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."