The end of Zechariah - only two chapters. I was tired when I read this and really didn't even want to do it because of a slight bug problem when I arrived back in NC, but knew God wanted me to be faithful to His Word.
13.1 - He is a fountain for cleansing. For sin - which is obvious, but also for Uncleanness: results of our sin that in OT times restricted the people from worshipping in the temple. God even cleanses us from that!
13.9 - He refines his own. He disciplines His children. So the opposite should be true. If we aren't being disciplined in our lives: something's wrong!