Sahih Bukhari
Sahih Bukhari Volume 002, Book 023, Hadith Number 404.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 23. Funerals (Al-Janaa'iz)
Narated By Abu Huraira : The Prophet (p.b.u.h) informed his companions about the death of AnNajashi and then he went ahead (to lead the prayer) and the people lined up behind him in rows and he said four Takbir.