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 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 4:18
"Do not allow the Kohathite tribal clans to be cut off from among the Levites.

2 Samuel 6:6
When they came to the threshing floor of Nacon, Uzzah reached out and took hold of the ark of God, because the oxen had stumbled.

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 every one to his service and to his burden: