It is written in "Bukhari Shareef" that after hearing the prayer call, Azaan, if anyone recites thefollowing Duroodthen he will certainly receive the Holy Prophets (sallal laahu alaihi wasallam) mercy andassistance on the Day ofJudgement.In another narration, Hazrat Abu Darda (radi Allahu anhu) says that Sayyiduna Rasoolullah (sallallaahu alaihiwasallam) himself used to recite this Durood Shareef after hearing the Azaan. He says that theHoly Prophet (sallallaahu alaihi wasallam) used to read this in such an audible voice that those sitting besides himused to hear it.The Durood is the following:ALLAHUMA RABBA HAZIHID DAWATIT TAAA MATTI WAS SALAATIL QAAIMATI AATIMUHAMMADINILWASILATA WAL FADEELATA WABASHU MAQAMAM MAHMUDANIL LAZI WA ADTAU."O Allah! For the sake of this call of prayer and for the sake of this prayer, give Thy assistance toMuhammad, ourmaster, and make him seated on the most exalted place which You had promised, i.e. theMaqaam-e-Mahmood".