Numbers 18:23
18:23 But the Levites must perform the service
of the tent of meeting, and they must bear their iniquity.
It will be a perpetual ordinance throughout your generations that among the Israelites the Levites
have no inheritance.
Numbers 19:10
19:10 The one who gathers the ashes of the heifer must wash his clothes and be ceremonially unclean until evening. This will be a permanent ordinance both for the Israelites and the resident foreigner who lives among them.
Numbers 19:21
19:21 “‘So this will be a perpetual ordinance for them: The one who sprinkles the water of purification must wash his clothes, and the one who touches the water of purification will be unclean until evening.