Musnad Abu Ya'la al-Mawsili 111:70

Sulayman Abu Ayyub al-Shadhakuni narrated to me, he said: Abd al-Rahman narrated to me, from Sufyan, from Ibn Abi Layla, from al-Hakam, from Miqsam, from Ibn Abbas, that the Prophet, peace and blessings of Allah be upon him, said to Abu Qatadah regarding the spoils of his victim: "Leave him and his spoils."