Musannaf Ibn Abi Shaybah 39676 — Reports on the conquest of Makkah

Amr bin Shu'ayb narrates from his father, from his grandfather, that on the day of the conquest of Makkah the Prophet (peace and blessings be upon him) said: "(All the rest of you) hold back your weapons, except Khuza'ah against Banu Bakr." And he (peace and blessings be upon him) permitted Khuza'ah until they had prayed the Asr prayer. Then he (peace and blessings be upon him) ordered them: "You (too) hold back your weapons." The next day a man of Banu Khuza'ah met a man of Banu Bakr and killed the man of Banu Bakr at al-Muzdalifah. This reached the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) stood up to deliver a sermon and said: "The person most hostile to Allah among the people is the one who kills (someone) in the sacred precinct, the one who kills (someone) other than his killer, and the one who kills in revenge from the Jahiliyyah."