Numbers 4:15-19

When Aaron and his sons have finished covering the holy objects and all the furnishings of the sanctuary, when the camp is to set out, after that the sons of Kohath shall come to carry them by the poles, so that they will not touch the holy objects and die. These are the things in the tent of meeting that the sons of Kohath are to carry.

“Now the responsibility of Eleazar the son of Aaron the priest is the oil for the light, the fragrant incense, the continual grain offering, and the anointing oil—the responsibility of all the tabernacle and everything that is in it, with the sanctuary and its furnishings.”

Then the Lord spoke to Moses and to Aaron, saying,

“Do not let the tribe of the families of the Kohathites be eliminated from among the Levites.

Rather, do this for them so that they will live and not die when they approach the most holy objects: Aaron and his sons shall go in and assign each of them to his work and to his load;