Numbers 18:22-23

Neither must the children of Israel henceforth come nigh the tabernacle of the congregation, lest they bear sin, and die. {and die: Heb. to die} But the Levites shall do the service of the tabernacle of the congregation, and they shall bear their iniquity: {it shall be} a statute for ever throughout your generations, that among the children of Israel they have no inheritance.