'Purified' in the Bible

Then Paul took those men and the next day purified himself with them. Then he went into the Temple to announce the time when their days of purification would end and when the sacrifice would be offered for each of them.

Now that you have obeyed the truth and have purified your souls to love your brothers sincerely, you must love one another intensely and with a pure heart.

Therefore, I advise you to buy from me gold purified in fire so you may be rich, white clothes to wear so your shameful nakedness won't show, and ointment to put on your eyes so you may see.