The Messenger of Allah ﷺ performed the funeral prayer over a deceased person, saying the takbir four times and giving a single salam.
أن رسول الله ﷺ صلى على جنازة، فكبر عليها أربعا، وسلم تسليمة واحدة.
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Daraqutni (2/77) narrated it from Ahmad bin Ishaq bin Bahlul, who said, our teacher Husayn bin Amr Anqazi told us, our teacher Ibrahim bin Ismail told us, our teacher Hafs bin Ghiyath told us, from Abu Anbas, from his father, from Abu Hurairah, and he mentioned it.Hakim also recorded it (1/360), and from him Bayhaqi (4/43), by another route from Hafs bin Ghiyath with his chain, similarly. It does not matter what is said about Hakim's teacher, Abu Bakr bin Abu Darim the Hafiz, whose name is Ahmad bin Muhammad bin Sari bin Yahya bin Abu Darim, as mentioned in Mizan, that he was a lying Rafidi, because the hadith is established through another route besides his.Hakim said, "The narration on this matter has been confirmed as sahih from Ali bin Abu Talib, Abdullah bin Umar, Abdullah bin Abbas, Jabir bin Abdullah, Abdullah bin Abu Awfa, and Abu Hurairah, that they used to give the taslim over the funeral prayer only once."I say, these reports were given connected chains by Bayhaqi. He also mentioned, with a suspended chain, from Ata bin Saaib, in mursal form, that the Prophet ﷺ gave the taslim over the funeral prayer only once.Abu Dawud also gave it a connected chain in his Marasil (408), by way of Abu Ishaq Fazari, from Ata bin Saaib, and he mentioned it. Abu Ishaq is not among those who narrated from Ata before his memory became confused.