Numbers 19:17

‘All the days of his dedication as a Nazirite to Yahweh he shall not go near to a dead person.

But there were some men who were unclean because of a dead person, so that they could not celebrate Passover on that day; so they came near before Moses and Aaron on that day.

“And you, camp outside the camp seven days; whoever has killed any person and whoever has touched any slain, purify yourselves, you and your captives, on the third day and on the seventh day.

everything that can stand the fire, you shall pass through the fire, and it shall be clean, but it shall be purified with water for impurity. But whatever cannot stand the fire you shall pass through the water.

“Then I will sprinkle clean water on you, and you will be clean; I will cleanse you from all your uncleanness and from all your idols.

“And after he is cleansed, seven days shall be counted for him.

“In that day a fountain will be opened for the house of David and for the inhabitants of Jerusalem, for sin and for impurity.

For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have been defiled sanctify for the cleansing of the flesh,