'Purify' in the Bible

The Jewish Passover was coming near, and many from that district went up to Jerusalem before the Passover, to purify themselves.

Associate with these men and purify yourself with them, and pay their expenses so that they can shave their heads. Then everybody will know that there is no truth in these stories about you, but that in your own actions you yourself scrupulously obey the Law.

Having therefore these promises, beloved friends, let us purify ourselves from all defilement of body and of spirit, and secure perfect holiness through the fear of God.

who gave Himself for us to purchase our freedom from all iniquity, and purify for Himself a people who should be specially His own, zealous for doing good works.

how much more certainly shall the blood of Christ, who strengthened by the eternal Spirit offered Himself to God, free from blemish, purify your consciences from lifeless works for you to serve the ever-living God?