His Tribal Duty: Collecting Blood Money
Each tribe settled in Mecca had an assigned responsibility with regard to the Ka‘bah and each task was delegated; the Banu Abd Manaf were assigned the duty of providing water and all necessary provisions for the pilgrims; the Banu Abd Dar were responsible for the banners used in battle and the safety of the Ka‘bah and maintaining of Dar al-Nadwah [assembly point where chiefs of the Quraish discussed important matters]. Leading the army in battle was assigned to the Banu Makhzum which was the tribe of Hazrat Khalid (ra) bin Walid; collecting blood money and matters related to that was assigned to the Banu Taym bin Murrah which was the tribe of Hazrat Abu Bakr (ra). When Hazrat Abu Bakr Siddiq (ra) became an adult, this responsibility was assigned to him.
(Muhammad Husain Haikal, Hazrat Abu Bakr Siddiq (ra) – translated, p. 59)
When Hazrat Abu Bakr (ra) would decide the amount for blood money, the Quraish would accept it and respect his decision, but if someone other than him would set the amount, the Quraish would shun him and refuse to accept it.
(Ali Ibn al-Athir, Usd al-Ghabah fi Ma‘rifat al-Sahabah, Vol. 3, Abdullah bin Uthman [Beirut, Lebanon: Dar al-Fikr, 2008], p. 311)