The purpose of forty Durood and salaam is to establish special love and bond with our beloved Prophet (Pbuh). Forty Durood and salaam is a litany, which Hazrat Maulana Ashraf Ali Thanwi Rahmatullahi-alaihi has compiled and from him Hazrat Shaykh Zakariya Rahmatullahi-alaihi narrates in 'Fazaail-e-durood Shareef''.
Hazrat writes ''his late eminence Hazrat Thanwi Rahmatullahi- alaihi has written in his book 'Zadu-saeed' forty Ahadith regarding the Durood and salaam which have also been referred in his other book 'Nashrut-Tib'. In order to get the blessings, which he has mentioned , I am including the forty Durood and salaam written by various Mashaaikh an example of which is the book 'Dalaa 'il-ul-Khairaat'. At this place only those sections are given which have been mentioned in Marfu' Ahaadith, whether Haqiqah (real) or hukmiah (imperative). Out of these, twenty-five are for Durood and fifteen for Salaam. In this way it is a collection of forty Ahadith about which the Holly Prophet (pbuh) has given a glad tiding :
''whosever conveys forty Ahadith, concerning any chapter of religion to my people, Allah will raise him with learned people and I will intercede for him.''