Numbers 4:15, 19

“After Aaron and his sons have finished covering the holy furnishings and all the holy articles, and when the camp is ready to move, only then are the Kohathites to come and do the carrying. But they must not touch the holy things or they will die. The Kohathites are to carry those things that are in the tent of meeting.

So 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 into the sanctuary and assign to each man his work and what he is to carry.