Bilangan 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.

Bilangan 36:12

36:12 They were married into the families of the Manassehites, the descendants of Joseph, and their inheritance remained in the tribe of their father’s family.

[19:8]  ¹ sn Here the text makes clear that he had at least one assistant.