Musannaf Ibn Abi Shaybah

Hazrat Yusuf bin Yaqub narrates that a man from among the polytheists killed a Muslim man, then that person entered (the Muslim area) under protection, so the brother of the Muslim killed him. Thus, Hazrat Umar bin Abdul Aziz decided upon the payment of blood money against him: and he placed the burden of this blood money upon his wealth and imprisoned him, and the blood money was sent to the heirs of the slain who were present among the people at war.