'Purification' in the Bible

And they brought seven bulls, seven rams, seven lambs, and seven male goats as a purification offering for the kingdom, for the sanctuary, and for Judah. And he commanded the descendants of Aaron, the priests, to offer [them] on the altar of Yahweh.

And the priests slaughtered them, and they made purification for sin with their blood upon the altar, to make an atonement for all Israel; because for all Israel, said the king, is the burnt-offering and the sin-offering.

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.