As-salamu 'alaykum The du'a for isal al-thawab you are mentioning exists, though I do not think that it is sunnat. I have not seen any shari' dalil for it, but it does not mean that you cannot do it, of course, one should. Allahumma balligh wa awsil thawaba ma qara'nahu wa nuran ma talawnahu awwalan ila ruhi sayyidina wa nabiyina wa shafi'ina wa mawlana Muhammadin, sallallahu 'alayhi wa alihi wa sallam, thumma ila arwahi jami'i l-anbiyai wa l-mursalin, salawatullahi wa salamuhu 'alayhim ajma'in, thumma ila arwahi jami'i s-sahabati wa l-qarabati wa t-tabi'ina, ridwanullahi 'alayhim ajma'in, thumma ila arwahi jami'i 'ibadika s-salihina wa awliyaika l-muttaqina, thumma ila abaina, wa ummahatina, wa abnaina wa banatina, wa ikhwanina, wa akhawatina, wa ustadhina, wa mashaikhina, wa likullin man haqqahu 'alayna wa li jami'i l-mu'minina wa l-mu'minati wa l-muslimina wa l-muslimati al-ahyai minhum wa l-amwat. It means, (not word for word translation) O' Allah, bring the reward and the light of what we have recite, first of all to the holy soul of the Prophet, sallallahu 'alayhi wa alihi wa sallam, and then to the holy souls of all the prophets and messengers, salawatullahi wa salamahu 'alayhim, then to blessed souls of all the sahaba, the relatives (of the Prophet) and the tabi'in, then to the blessed souls of your pious slaves and your God-fearing friends (awliya), and then to our fathers and mothers, sons and daughters, brothers and sisters, teachers and shuyukh, and to everone that has a right upon us, and to all the mumins, males and females, and the muslims, males and females, those who are living and those who has left the world. I'll see if I can find time to write it into arabic, so it may be easier for you to read. Allah Hafiz Ibn Amin I wrote both the du'a and made the translation in a bit hurry. If anyone finds faults in it, please correct it.