'Purify' in the Bible

"Oh people of Jerusalem, purify your hearts from evil so that you may yet be delivered. How long will you continue to harbor up wicked schemes within you?

Therefore the Lord who rules over all says, "I will now purify them in the fires of affliction and test them. The wickedness of my dear people has left me no choice. What else can I do?

I will purify them from all the sin that they committed against me. I will forgive all their sins which they committed in rebelling against me.