Volume 2 · Book 23 · Hadith 455
Narrated Asma' bint Abi Bakr : Allah's Apostle once stood up delivering a sermon and mentioned the trial which people will face in the grave. When he mentioned that, the Muslims started shouting loudly.
— Sahih Bukhari, Volume 2, Book 23: Funerals (Al-Janaa'iz), Hadith #455