حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، أَنَّ سَائِبَةً، أَعْتَقَهُ بَعْضُ الْحُجَّاجِ فَقَتَلَ ابْنَ رَجُلٍ مِنْ بَنِي عَائِذٍ فَجَاءَ الْعَائِذِيُّ أَبُو الْمَقْتُولِ إِلَى عُمَرَ بْنِ الْخَطَّابِ يَطْلُبُ دِيَةَ ابْنِهِ فَقَالَ عُمَرُ لاَ دِيَةَ لَهُ ‏.‏ فَقَالَ الْعَائِذِيُّ أَرَأَيْتَ لَوْ قَتَلَهُ ابْنِي فَقَالَ عُمَرُ إِذًا تُخْرِجُونَ دِيَتَهُ فَقَالَ هُوَ إِذًا كَالأَرْقَمِ إِنْ يُتْرَكْ يَلْقَمْ وَإِنْ يُقْتَلْ يَنْقَمْ ‏.‏

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." Translation Not Available

Book Ref: Muwatta Imam Malik Book 43 Hadith 1598
Web Ref:  Muwatta Imam Malik Book 43 Hadith 15