Numbers 19:7, 8, 12, 13, 19-21

After that, the priest must wash his clothes and bathe himself with water. He may then come into the camp, but he will be ceremonially unclean till evening.

The man who burns it must also wash his clothes and bathe with water, and he too will be unclean till evening.

They must purify themselves with the water on the third day and on the seventh day; then they will be clean. But if they do not purify themselves on the third and seventh days, they will not be clean.

If they fail to purify themselves after touching a human corpse, they defile the LORD’s tabernacle. They must be cut off from Israel. Because the water of cleansing has not been sprinkled on them, they are unclean; their uncleanness remains on them.

The man who is clean is to sprinkle those who are unclean on the third and seventh days, and on the seventh day he is to purify them. Those who are being cleansed must wash their clothes and bathe with water, and that evening they will be clean. But if those who are unclean do not purify themselves, they must be cut off from the community, because they have defiled the sanctuary of the LORD. The water of cleansing has not been sprinkled on them, and they are unclean. This is a lasting ordinance for them. “The man who sprinkles the water of cleansing must also wash his clothes, and anyone who touches the water of cleansing will be unclean till evening.