'Purify' in the Bible

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

Take these men, purify yourself along with them, and pay for them to get their heads shaved. Then everyone will know that what they were told about you amounts to nothing, but that you yourself are also careful about observing the law.

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