Sunan an-Nasa'i 1991
سنن النسائي#1991SahihIt was narrated from 'Aishah that the Prophet said:"There is no deceased person for whom a group of Muslims whose number reaches one hundred, offers the funeral prayer, interceding for him; but their intercession for him will be accepted." (One of the narrators) Sallam said: "I narrated it to Shu'aib bin Al-Habhab and he said: 'Anas bin Malik narrated it to me from the Prophet
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 21:174