(40) باب مَنْ جَلَسَ عِنْدَ الْمُصِيبَةِ يُعْرَفُ فِيهِ الْحُزْنُ
Narrated Anas:
When the reciters of Qur'an were martyred, Allah's Messenger (ﷺ) recited Qunut for one month and I never saw him (i.e. Allah's Messenger (ﷺ)) so sad as he was on that day. (ES)
Reference (ES): Sahih al-Bukhari 1300 (ES)
In-book reference (ES): Book 23, Hadith 59 (ES)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 23, Hadith 387 (ES)