s 9
If any person attests the execution of any will to whom or to whose wife or husband any beneficial devise, legacy, estate, estate, interest, gift or appointment shall, so far only as concerns such person attesting the execution of such will, or the wife or husband of such person, or any person claiming under such person or wife or husband, be utterly null and void, and such person so attesting shall be admitted as a witness to prove the execution or to prove the validity or invalidity thereof, notwithstanding such devise, legacy, interest, gift of appointment mentioned in such will. Creditor attesting a will charging estate with debts shall be admitted a witness