Sahih Muslim Hadith 1550

English

[1550] 302 – ( … ) It was narrated that "Asim said: "I heard Anas say: 'I never saw the Messenger of Allah 40 grieve so much at the loss of a party as he grieved at the loss of the seventy [who were] killed at Bi'r Ma'ünah, who were known as Al-Qurra' (the reciters). He continued to pray against their killers for a month."