Numbers 5:24

5:24 He will make the woman drink the bitter water that brings a curse, and the water that brings a curse will enter her to produce bitterness.

Numbers 19:8

19:8 The one who burns it ¹  must wash his clothes in water and bathe himself in water. He will be ceremonially unclean until evening.

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¹ sn Here the text makes clear that he had at least one assistant.