Numbers 1:51
Whenever the tabernacle is to move, the Levites are to take it down, and whenever it is to be pitched, the Levites are to set it up. Any outsider who goes near it must be put to death.

Numbers 4:15
When Aaron and his sons have finished covering the holy objects and all their equipment, as soon as the camp is ready to move, the Kohathites shall come and do the carrying. But they must not touch the holy objects, or they will die. These are the transportation duties of the Kohathites regarding the Tent of Meeting.

Numbers 18:4
They are to join you and attend to the obligations of the Tent of Meeting, doing all the work at the Tent; but no outsider may come near you.

Numbers 18:7
But only you and your sons shall attend to your priesthood for everything concerning the altar, and for 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."

Numbers 31:30
From the Israelites' half, take one out of every fifty, whether persons, cattle, donkeys, sheep, or other animals, and give them to the Levites who keep charge of the tabernacle of the LORD."

Ezekiel 44:13
They must not approach Me to serve Me as priests or come near any of My holy things or the most holy things. They will bear the shame of the abominations they have committed.