Funerals (Al-Janaa'iz)

Bukhari :: Book 2 :: Volume 23 :: Hadith 387

Narrated Anas:

When the reciters of Quran were martyred, Allah's Apostle recited Qunut for one month and I never saw him (i.e. Allah's Apostle) so sad as he was on that day.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star