Bismillahir Rehmanir Raheem
ALLAHUMMA SALLI ALA MUHAMMADIM MA DAAMATIS SALAWAATU WAS SALLI ALA MUHAMMADIM MADAAMATIR RAHMATI WA SALLI ALA MUHAMMADIM MADAAMATIL BARAKAATU WA SALLI ALA RUHI MUHAMMADIN FIL ARWAAHI WA SALLI ALA SURATI MUHAMMADIN FIS SUWARI WA SALLI ALA ISMI MUHAMMADIN FIL ASMAAA'I WA SALLI ALA NAFSI MUHAMMADIN FIL NUFUSI WA SALLI ALA QALBI MUHAMMADIN FIL QULUBI WA SALLI ALA QABRI MUHAMMADIN FIL QUBURI WA SALLI ALA RAWDATI MUHAMMADIN FIR RIYAADI WA SALLI ALA JASADI MUHAMMADIN FIL AJSAADI WA SALLI ALA TURBATI MUHAMMADIN FIT TURABI WA SALLI ALA KHAIRI KHALQIHI SAYYIDINA MUHAMMADIW WA ALA ALIHI WA ASHABIHI WA AZWAAJIHI WAZURIYAATIHI WA AHLI BAYTIHI WA AHBABIHI AJMA'INA BIRAHMATIKA YAAA AR HAMAR RAAHIMEEN.
"O Allah! Shower Thy blessings on Hazrat Muhammad ever and ever until Thy blessings are to be showered. Grant Thy bounty and mercy on Muhammad until Thy bounty is granted and mercy is showered. The most selected favours on the Spirit of Muhammad amongst all persons, on the name of Muhammad amongst all names, on the heart of Muhammad amongst all hearts. Thy most bountiful favours on the grave of Muhammad amongst all graves, on the tomb of Muhammad amongst all the bodies, on the clay of Muhammad (tomb) amongst all clays. May Allah shower His blessings on Muhammad the best of all that and on the descendants of Muhammad, on the Companions of Muhammad, on the friends of Muhammad, and on all his family members, O! Merciful Almighty Allah and Great Merciful".
This Salawat is usually recited in the graveyard while paying homage to the deceased. When it is recited, Allah showers His blessings on the deceased. When the sons go to the graveyard they should recite the above Durood Shareef on the graves of their father and mother, and all the parents who have passed away.
Even many auliyas have instructed to read this. Auliyas like Hazrat khwaja Abdul bhai qaseer (RA) ( Khaleefa-e-Hazrat Khwaja-e-Bangalore ) use to instruct many to read this darood in Qabrastaan. This is also known as Darood-e-Qabrastaan or Durood-e-Hazaari.
If this durood is recited once ( 1 time ) near newly deceased person, there will be no azaab to the person inside the grave because of the greatness of this durood shareef.
When this Durood is recited ( 3 times ) in Qabarstaan because of its barkaat allah will take 80 years azaab from Qabrastan.
When this Durood is recited ( 4 times ) in Qabarstaan because of its Barkaat allah will take away azaab from qabrastan till qayamat.
When this Durood is recited ( 24 times ) by a person for the bakish of his parents and send to his parents, then because of its barkaat allah will send 1000 faristas and the faristas will do the ziarat of his parents till qayamat
( This Durood has a great importance and printed in all the durood books available in the market )
Hadrat Anas Radi ALLAH Taala Anhu reported that the Messenger of Allah Peace And Blessings Be Upon Him has said, “Everything has a heart, and the heart of the Qur’an is Yasin. Allah records anyone who recites Yasin as having recited the Qur’an ten times.”
[Sunan Tirmidhi, Vol 2, Page 116 - Sunan Daarimi, Vol 2, Page 336]