Sunan an-Nasa'i 1918
سنن النسائي#1918SahihIt was narrated that Abu Hurairah and Abu Sa'eed said:"We never saw the Messenger of Allah attend any funeral where he sat down until (the body) was placed (in the grave)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahHasan Isnaad
Al-AlbaniHasan Isnaad
Zubair Ali ZaiSahih
In-book reference: 21:101