There is a law by an earthenware vessel that if it had been used for food it absorbs some of that food and it never comes out.  It cannot be used again for a different type of food, but rather must be smashed.  This law is taught to us by the sin offering.  Since the law applies throughout, why is it specifically mentioned here?  The Kli Yakar answers that a person who sins absorbs the taste of sin within, the only way to get it out is to “smash” ie. a person feels such sincere regret that his heart is broken by the pain of sinning, than he can be purified and be a new person.  Let us try not to sin, but when we do let us regret out errors and resolve to correct them.