Numbers 3:10
So you shall appoint Aaron and his sons to carry out the duties of the priesthood; but any layman who approaches the tabernacle must be put to death."

Numbers 3:38
Moses, Aaron, and Aaron's sons were to camp to the east of the tabernacle, toward the sunrise, before the Tent of Meeting. They were to perform the duties of the sanctuary as a service on behalf of the Israelites; but any outsider who approached the sanctuary was to be put to death.

Numbers 4:1
Then the LORD said to Moses and Aaron,

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 4:19
In order that they may live and not die when they come near the most holy things, do this for them: Aaron and his sons are to go in and assign each man his task and what he is to carry.

Numbers 16:40
just as the LORD commanded him through Moses. This was to be a reminder for the Israelites that no outsider who is not a descendant of Aaron should approach to offer incense before the LORD, lest he become like Korah and his followers.

Numbers 17:13
Anyone who comes near the tabernacle of the LORD will die. Are we all going to perish?"

Numbers 18:3
And they shall attend to your duties and all the duties of the Tent; but they must not come near to the furnishings of the sanctuary or the altar, or both they and you will die.

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 18:22
No longer may the Israelites come near the Tent of Meeting, or they will incur guilt and die.