'Cleansing' in the Bible

"'If any man dies very suddenly beside him, and he defiles the head of his separation; then he shall shave his head in the day of his cleansing. On the seventh day he shall shave it.

You shall do this to them, to cleanse them: sprinkle the water of cleansing on them, let them shave their whole bodies with a razor, and let them wash their clothes, and cleanse themselves.