After that, the priest must wash his clothes and bathe himself with water.1 He may then come into the camp, but he will be ceremonially unclean till evening.
References for Numbers 19:7
The man who burns it must also wash his clothes and bathe with water, and he too will be unclean till evening.
"A man who is clean shall gather up the ashes of the heifer2 and put them in a ceremonially clean place3 outside the camp. They shall be kept by the Israelite community for use in the water of cleansing;4 it is for purification from sin.5
References for Numbers 19:9
The man who gathers up6 the ashes of the heifer must also wash his clothes, and he too will be unclean till evening.7 This will be a lasting ordinance8 both for the Israelites and for the aliens living among them.9
References for Numbers 19:10