Zaid b. Arqam used to utter four takbirs (Allah is Most Great) over our dead person (during prayer). He uttered five takbirs on a dead person. So I asked him. He replied: The Messenger of Allah (ﷺ) used to utter those.
Abu Dawud said: I remember the tradition of Ibn al-Muthanna in a more guarded way.
Reference: Sunan Abi Dawud 3197 In-book : Book 21, Hadith 109 English translation : Book 20, Hadith 3191
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