Musannaf Ibn Abi Shayba 28:562

'Abd al-Rahim ibn Sulayman narrated to us, from Muhammad ibn Ishaq, from 'Abd Allah ibn Abi Bakr, who said: It was narrated to me from Abu Qatada al-Ansari that he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever kills a person, he has his spoils." He said: So I said, "O Messenger of Allah, I killed a person, then the fighting distracted me from him, so I do not know who took his spoils." A man from the people of Mecca said, "He has spoken the truth, O Messenger of Allah. He killed a person, and I took his spoils, so satisfy him on my behalf." Abu Bakr said, "No, by Allah, you shall not do that. You would go to a lion from the lions of Allah, fighting for Him, and you would share his spoils with him?" The Messenger of Allah (peace and blessings of Allah be upon him) said, "He has spoken the truth; give him his spoils."