Numbers 4:15–20

¹⁵And when Aaron and his sons have made an end of covering the sanctuary, and all the furniture of the sanctuary, as the camp is set forward; after that, the sons of Kohath shall come to bear it: but they shall not touch the sanctuary, lest they die. These things are the burden of the sons of Kohath in the tent of meeting. ¹⁶And the charge of Eleazar the son of Aaron the priest shall be the oil for the light, and the sweet incense, and the continual meal-offering, and the anointing oil, the charge of all the tabernacle, and of all that therein is, the sanctuary, and the furniture thereof.

¹⁷And Jehovah spake unto Moses and unto Aaron, saying, ¹⁸Cut ye not off the tribe of the families of the Kohathites from among the Levites; ¹⁹but thus do unto them, that they may live, and not die, when they approach unto the most holy things: Aaron and his sons shall go in, and appoint them every one to his service and to his burden; ²⁰but they shall not go in to see the sanctuary even for a moment, lest they die.