'Purification' in the Bible

When someone suddenly dies beside him, so that his consecrated head is defiled, then he is to shave his head on the day of his purification. Seven days later he is to shave it again.

Then someone who is unclean is to gather the ashes of the heifer and lay them outside the camp in a clean place. This is to be done for the community of Israel to use for water of purification from sin.