Get To Work:-)

It says in the pasuk כי ביום הזה יכפר עליכם לטהר אתכם מכל חטאתיכם - Meaning, that on this day [Yom Kippur] Hashem will atone for you to forgive you for all your sins.

The Beis Avraham of Slonim read it differently - כי ביום הזה יכפר , on this day Hashem will atone. עליכם לטהר אתכם, [but] you have to purify yourselves!