Abu Musa Ashari reported,

When the Prophet ﷺ finished the battle of Hunayn, he dispatched Abu Amir at the head of an army to Awtas. There he encountered Durayd bin al-Simma. Durayd was killed and Allah routed his companions.Abu Musa said, "He sent me along with Abu Amir. Abu Amir was struck in the knee by an arrow shot by a man from the Jusham tribe, which lodged in his knee. I came up to him and said, 'Uncle, who shot you?'He pointed to a particular man and said, 'That one is my killer, the one who shot me.'So I made for him and caught up with him. When he saw me, he turned to flee, and I pursued him, calling out, 'Have you no shame? Will you not stand and fight?' He stopped, and we exchanged two strokes with the sword, and I killed him.Then I said to Abu Amir, 'Allah has killed the man who struck you.'He said, 'Pull out this arrow.' I pulled it out, and water flowed from the wound.He said, 'Nephew, convey my greetings to the Prophet ﷺ and tell him to ask forgiveness for me.' Abu Amir appointed me as his successor in command over the men. He lingered a little while, then died.I returned and came to the Prophet ﷺ in his house. He was on a rope-bed without a mattress, and the rope had left its marks on his back and sides. I informed him of our news and the news of Abu Amir, and I said, 'He told me to ask you to pray for forgiveness for him.'The Prophet ﷺ called for water, performed ablution, then raised his hands and said, 'O Allah, forgive Ubayd Abu Amir.' I saw the whiteness of his armpits. Then he said, 'O Allah, on the Day of Resurrection place him above many of Your creatures among mankind.'I said, 'And for me too, ask forgiveness.'He said, 'O Allah, forgive Abdullah bin Qays his sin, and admit him on the Day of Resurrection through a noble entrance.'"Abu Burda said, "One of the two supplications was for Abu Amir, and the other was for Abu Musa."

عن أبي موسى قال

لما فرغ النبي ﷺ من حنين بعث أبا عامر على جيش إلى أوطاس، فلقي دريد بن الصمة، فقتل دريد وهزم الله أصحابه، قال أبو موسى: وبعثني مع أبي عامر، فرمي أبو عامر في ركبته، رماه جشمي بسهم فأثبته في ركبته، فانتهيت إليه فقلت: يا عم من رماك؟ فأشار إلى أبي موسى فقال: ذاك قاتلي الذي رماني، فقصدت له فلحقته، فلما رآني ولى فاتبعته وجعلت أقول له: ألا تستحي، ألا تثبت، فكف، فاختلفنا ضربتين بالسيف فقتلته، ثم قلت لأبي عامر قتل الله صاحبك، قال: فانزع هذا السهم، فنزعته فنزا منه الماء، قال: يا ابن أخي اقرئ النبي ﷺ السلام وقل له: استغفر لي، واستخلفني أبو عامر على الناس، فمكث يسيرا ثم مات، فرجعت فدخلت على النبى ﷺ فى بيته على سرير مرمل وعليه فراش، قد أثر رمال السرير بظهره وجنبيه، فأخبرته بخبرنا وخبر أبي عامر، وقال: قل له: استغفر لي، فدعا بماء فتوضأ، ثم رفع يديه فقال: اللهم اغفر لعبيد أبي عامر. ورأيت بياض إبطيه، ثم قال: اللهم اجعله يوم القيامة فوق كثير من خلقك من الناس. فقلت: ولي فاستغفر، فقال: اللهم اغفر لعبد الله بن قيس ذنبه، وأدخله يوم القيامة مدخلا كريما. قال أبو بردة: إحداهما لأبي عامر، والأخرى لأبي موسى.