'Purification' in the Bible

And a man that is clean shall gather up the ashes of the heifer, and lay them up without the camp in a clean place, and it shall be kept for the congregation of the children of Israel for a water of separation: it is a purification for sin.

And for an unclean person they shall take of the ashes of the burnt heifer of purification for sin, and running water shall be put thereto in a vessel:

That prepareth his heart to seek God, the LORD God of his fathers, though he be not cleansed according to the purification of the sanctuary.

And both the singers and the porters kept the ward of their God, and the ward of the purification, according to the commandment of David, and of Solomon his son.

And let the king appoint officers in all the provinces of his kingdom, that they may gather together all the fair young virgins unto Shushan the palace, to the house of the women, unto the custody of Hege the king's chamberlain, keeper of the women; and let their things for purification be given them:

And the maiden pleased him, and she obtained kindness of him; and he speedily gave her her things for purification, with such things as belonged to her, and seven maidens, which were meet to be given her, out of the king's house: and he preferred her and her maids unto the best place of the house of the women.