law: Code of Criminal Procedure Act, 1973
  479.Case in which Judge or Magistrate is personally
  
  interested.-
  No Judge or Magistrate shall, except with the permission of the
  
  Court to which an appeal lies from his Court, try or commit for trial any case
  
  to or in which he is a party, or personally interested, and no Judge or
  
  Magistrate shall hear an appeal from any judgment or order passed or made by
  
  himself.
  Explanation.-A Judge or Magistrate shall not be deemed to
  
  be a party to, or personally interested in, any case by reason only that he is
  
  concerned therein in a public capacity, or by reason only that he has viewed
  
  the place in which an offence is alleged to have been committed or any other
  
  place in which any other transaction material to the case is alleged to have
  
  occurred and made an inquiry in connection with the case.