Hadith Of Ashra Mubashara
Itmam-e-Hujjat works both ways. Not only the rejecters are punished, but when a Prophet (specifically rasul) gains ascendancy, the shohadahs, Sabiqoon and Siddeqeen of Rasul’s time are also rewarded in this world. It is not something unusual if among those people were a few given glad tidings because of other extreme of itmam-e-Hujjat law because their judgement happened in this world. Just like muanedeen, who were ordered to be killed no matter what (whether from jews or pagans), the other extreme is the sabiqoon, siddeqeen and shohadah of Rasul’s time, who were given glad tidings in this world of their success. Its not about that particular Hadith of ten Sahaba only, such verses can be found in Quran as well for the whole group of Sahabas where they are called Khair-e-ummat, given rank of Shahdah and many others as well.