Numbers 4:17

14 They shall put on it all its vessels with which they minister about it, the fire pans, the meat hooks, the shovels, and the basins—all the vessels of the altar; and they shall spread on it a covering of sealskin, and put in its poles.

15 “When Aaron and his sons have finished covering the sanctuary and all the furniture of the sanctuary, as the camp moves forward; after that, the sons of Kohath shall come to carry it; but they shall not touch the sanctuary, lest they die. The sons of Kohath shall carry these things belonging to the Tent of Meeting.

16 “The duty of Eleazar the son of Aaron the priest shall be the oil for the light, the sweet incense, the continual meal offering, and the anointing oil, the requirements of all the tabernacle, and of all that is in it, the sanctuary, and its furnishings.”

17 The LORD spoke to Moses and to Aaron, saying,

18 “Don’t cut off the tribe of the families of the Kohathites from among the Levites;

19 but do this to them, that they may live, and not die, when they approach the most holy things: Aaron and his sons shall go in and appoint everyone to his service and to his burden;

20 but they shall not go in to see the sanctuary even for a moment, lest they die.”