Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) narrates that when Allah Almighty caused the Banu Hawazin to be defeated at Hunayn, the Messenger of Allah appointed Sayyiduna Abu Amir Ash'ari (may Allah be pleased with him) over a cavalry detachment to pursue the fleeing polytheists. He set out after them, and I was with him. Sayyiduna Abu Amir's horse swiftly carried him ahead, and he caught up with Ibn Duraid bin. Ibn Duraid killed Abu Amir (may Allah be pleased with him) and seized his flag. I pursued Ibn Duraid, killed him, and took the flag back into my possession, and I returned with the people. The Messenger of Allah (peace and blessings be upon him) saw me carrying the flag and said: "O Abu Musa! Has Abu Amir been killed?" I replied: "Yes, O Messenger of Allah!" I saw the Messenger of Allah (peace and blessings be upon him) raising both his hands and supplicating: "O Allah, make Your beloved servant Ubaid Abu Amir among those on the Day of Resurrection who have many righteous deeds and countless exalted ranks."

Sayyiduna Abu Musa (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: O Allah! Grant Abu Amir Ubaid superiority over most people in rank on the Day of Resurrection. Sayyiduna Ubaid (may Allah be pleased with him) was martyred on the day of Autas, and Sayyiduna Abu Musa (may Allah be pleased with him) killed Ubaid’s killer (Ibn Duraid). Abu Wa’il says: I hope that Allah Almighty will not gather Ubaid’s killer and my father together in Hell.