Sunan an-Nasa'i 1997
سنن النسائي#1997SahihIt was narrated that Abu Hurairah said:"The Messenger of Allah said: 'Whoever follows a funeral and offers the funeral prayer then leaves, will have one Qirat reward. And whoever follows it and offers the funeral prayer then stays until the burial is completed will have two Qirat of reward, both of which are greater than Uhud
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahHasan Sahih
Al-AlbaniHasan Sahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 21:180