Raising the forefinger when saying Laa ilaaha ill-Allaah after prayer
Question

                Is raising the forefinger when saying Laa ilaaha ill-Allaah after one has finished saying Subhaan-Allaah, al-hamdu Lillaah and Allaahu akbar proven (to be Sunnah)?.
Praise be to Allah.Saying Subhaan-Allaah, 
    al-hamdu Lillaah, Allaahu akbar and Laa ilaaha ill-Allaah following the 
    prayer is a Sunnah that is proven from the Prophet  (peace and blessings 
    of Allaah be upon him) in word and in deed, and there is a great deal of 
    reward in that. Among the reports that speak of that is the report narrated 
    by Muslim (597) from Abu Hurayrah, that the Messenger of Allaah  (peace 
    and blessings of Allaah be upon him) said: Whoever glorifies Allaah 
    thirty-three times after every prayer, and praises Allaah thirty-three 
    times, and magnifies Allaah thirty-three times, making ninety-nine, and 
    completes it by saying, ‘There is no god but Allaah alone, with no partner 
    or associate; His is the Dominion, to Him be praise, and He is Able to do 
    all things,’ his sins will be forgiven even if they are like the foam of the 
    sea.” 
As for raising the 
    forefinger when saying Laa ilaaha ill-Allaah at this point,, we could not 
    find anything to indicate that it is proven to be Sunnah. 
And Allaah knows best.