Yahya related to me from Malik from Abu'z-Zinad from Sulayman ibnYasar that a slave was set free by one of the people on hajj and hismaster had abandoned the right to inherit from him. The ex-slave thenkilled a man from the Banu A'idh tribe. An A'idhi, the father of theslain man came to Umar ibn al-Khattab seeking the blood-money of hisson. Umar said, "He has no blood-money." The A'idhi said, "What wouldyou think if it had been my son who killed him?" Umar said, "Then youwould pay his blood-money." He said, "He is then like the black andwhite Arqam snake. If it is left, it devours and if it is killed, ittakes revenge."
USC-MSA web (English) reference: Book 43, Hadith 15
Arabic reference: Book 43, Hadith 1598