Numbers 18:3
They are to take care of your concerns and all the responsibilities involved with the tent. But they're not to approach the holy vessels or the altar. That way, neither you nor they will die.
Numbers 4:15
"When Aaron and his sons have finished covering the sanctuary and all the utensils of the sanctuary, and the camp is about to travel, then the descendants of Kohath are to come and carry them, but they are not to touch the most sacred objects, so they won't die. These are the duties of the descendants of Kohath at the Tent of Meeting."
Numbers 3:25
The duties of the descendants of Gershon at the Tent of Meeting pertained to the tent, the tent covering, the curtain to the entrance to the Tent of Meeting,
Numbers 3:31
Their duties pertained to the ark, the table, the lamp stand, the altars, the utensils of the sanctuary with which they ministered, and all the curtains in use.
Numbers 3:36
The duties of the caretakers from the descendants of Merari included the boards of the tent, its bars, crossbars, sockets, all its utensils for their services,
Numbers 4:19-20
But do this for them so that they may live and not die when they approach the Most Holy Place: Aaron and his sons are to go in and set specific responsibilities for each of them to carry out.
Numbers 16:40
to serve as a memorial to the Israelis, a reminder that no unauthorized person, who isn't a descendant of Aaron, is to attempt to burn incense in the LORD'S presence, so that he may not become like Korah and his group, just as the LORD had spoken by the authority of Moses.
Numbers 1:51
Whenever the tent is ready for travel, the descendants of Levi are to take it down. When it's time to encamp, the descendants of Levi are to set it up. Any unauthorized person who approaches it is to be executed.
Numbers 18:7
Now you and your sons with you are to maintain your priestly duties and all matters that concern the altar and what is housed within the veil. You are to perform these services. I'm giving you the priesthood as a gift of service, but any unauthorized person who approaches is to be put to death."