Bulugh al-Maram #666
Funerals
Ibn ‘Abbas (RAA) narrated, ‘I heard the Messenger of Allah (ﷺ) say, "If a Muslim man dies and a group of forty people, who do not associate any one with Allah, pray for him, Allah will accept their intercession for him (by way of their Du’A for him.” Related by Muslim.
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About Bulugh al-Maram
This hadith is #666 from Bulugh al-Maram, in the Book of Funerals. Bulugh al-Maram contains 1,767 hadiths across 16 books.