'Purify' in the Bible

Now the Passover of the Jews was near, and many went up to Jerusalem out of the country before the Passover to purify themselves.

take them and purify yourself along with them, and pay their expenses so that they may shave their heads; and all will know that there is nothing to the things which they have been told about you, but that you yourself also walk orderly, keeping the Law.

who gave Himself for us to redeem us from every lawless deed, and to purify for Himself a people for His own possession, zealous for good deeds.

Draw near to God and He will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded.