Numbers 18:3

And they shall keep your charge and the charge of all the tabernacle. Only they shall not come near the vessels of the sanctuary and the altar, so that neither they nor you also may die.

Numbers 4:15

And when Aaron and his sons have made an end of covering the sanctuary, and all the vessels of the sanctuary, when the camp is to set forward, then after that the sons of Kohath shall come to carry it. But they shall not touch any holy thing lest they die. These are the burden of the sons of Kohath in the tabernacle of the congregation.

Numbers 3:25

And the charge of the sons of Gershon in the tabernacle of the congregation shall be the tabernacle, and the tent, and its covering, and the veil for the door of the tabernacle of the congregation,

Numbers 3:31

And their charge shall be the ark, and the table, and the lampstand, and the altars, and the vessels of the sanctuary with which they minister, and the veil, and all the service of it.

Numbers 3:36

And the office and charge of the sons of Merari were the boards of the tabernacle, and its bars, and its pillars, and its sockets, and its vessels, and all its service,

Numbers 4:19-20

But do this to them, and they shall live and not die when they approach the Holy of Holies. Aaron and his sons shall go in and appoint each one of them to his service and to his burden.

Numbers 16:40

a memorial to the sons of Israel, that no stranger not of the seed of Aaron may come near to offer incense before Jehovah, so that he may not be as Korah and as his company, as Jehovah said to him by the hand of Moses.

Numbers 1:51

And when the tabernacle sets forth, the Levites shall take it down. And when the tabernacle is to be pitched, the Levites shall set it up. And the stranger who comes near shall die.

Numbers 18:7

Therefore you and your sons with you shall keep your priests' office for everything of the altar and inside the veil. And you shall serve. I have given your priest's office as a service of gift. And the stranger that comes near shall be put to death.

Treasury of Scripture Knowledge

Summary

And they shall keep thy charge, and the charge of all the tabernacle: only they shall not come nigh the vessels of the sanctuary and the altar, that neither they, nor ye also, die.

Neither

General references

Bible References

Only they

Numbers 3:25
And the charge of the sons of Gershon in the tabernacle of the congregation shall be the tabernacle, and the tent, and its covering, and the veil for the door of the tabernacle of the congregation,
Numbers 4:19
But do this to them, and they shall live and not die when they approach the Holy of Holies. Aaron and his sons shall go in and appoint each one of them to his service and to his burden.
Numbers 16:40
a memorial to the sons of Israel, that no stranger not of the seed of Aaron may come near to offer incense before Jehovah, so that he may not be as Korah and as his company, as Jehovah said to him by the hand of Moses.

Neither

Numbers 4:15
And when Aaron and his sons have made an end of covering the sanctuary, and all the vessels of the sanctuary, when the camp is to set forward, then after that the sons of Kohath shall come to carry it. But they shall not touch any holy thing lest they die. These are the burden of the sons of Kohath in the tabernacle of the congregation.

General references

Hebrews 5:4
And no man takes this honor to himself, but he who is called of God, as Aaron was.