Numbers 18:22

Neither must the children of Israel henceforth come nigh the tabernacle of the congregation,.... To do any part of the priest's office, as to burn incense, as Korah and his company had done; or to do any part of the work of the Levites, by watching in the tabernacle, by taking it down and setting it up, and bearing the vessels of it; otherwise they might come to it, to bring their sacrifices, to pay their vows, and for their purification when necessary, and such like things:

lest they bear sin and die; lest sin be charged upon them, and punishment be inflicted, even the punishment of death; for it was death to intrude into the priest's office.