It wasnarrated from Abu Hurairah that the Prophet (ﷺ) said:
"Whoeverhas the funeral prayer offered for him by one hundredMuslims, hewill be forgiven." (RU)
English reference (RU): Vol. 1, Book 6, Hadith 1488 (RU)
Arabic reference (RU): Book 6, Hadith 1555 (RU)