It wasnarrated that 'Abdur-Rahman bin Abi Laila said:
"Zaid binArqanused to say the Takbir four times in the funeral prayer, and hesaidthe Takbir five times for one funeral. I asked him (about that)andhe said: 'The Messenger of Allah (ﷺ) used to do that.'" (FR)
English reference (FR): Vol. 1, Book 6, Hadith 1505 (FR)
Arabic reference (FR): Book 6, Hadith 1572 (FR)