Ibn Ishaq said: Uqbah bin Abi Mu'ayt and al-Nadr bin al-Harith were among the captives. When they were at al-Safra', Ali bin Abi Talib (may Allah be pleased with him) killed al-Nadr bin al-Harith, as I was told. When he (peace and blessings be upon him) was at the place called Irq al-Zabyah, Uqbah bin Abi Mu'ayt was also killed. When the Messenger of Allah (peace and blessings be upon him) ordered that Uqbah be killed, Uqbah said: Who will look after (my) children? He (peace and blessings be upon him) said: "The Fire." And Asim bin Thabit bin Abi al-Aqlah (may Allah be pleased with him) killed him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12855