'Purify' in the Bible

take them and purify yourself along with them and pay their expenses, so that they may have their heads shaved. Then everyone will know there is nothing in what they have been told about you, but that you yourself live in conformity with the law.

He gave himself for us to set us free from every kind of lawlessness and to purify for himself a people who are truly his, who are eager to do good.

how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our consciences from dead works to worship the living God.