'Purification' in the Bible

And thus shalt thou do unto them, to cleanse them: sprinkle upon them water of purification from sin; and they shall pass the razor over all their flesh, and shall wash their garments, and make themselves clean.

And a clean man shall gather the ashes of the heifer, and deposit them outside the camp in a clean place, and it shall be kept for the assembly of the children of Israel for a water of separation: it is a purification for sin.