Umm Abdullah (may Allah be pleased with her) narrates from her father, and he from his father (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) said: "Whoever obtains a slave, his belongings also belong to him (the master)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12858
It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him): When it was the day of Hunayn (and he related the hadith about his killing a man), he said: I went to the Messenger of Allah (peace and blessings be upon him) and heard him say: "Whoever has proof over a captive, his spoils are his."
The hadith masters (huffaz) regard this as a mistake. (In the narration of al-Layth) it is: "Whoever has proof over a slain man, his spoils are his," and (in the narration of Malik) it is: "Whoever kills a man and has proof of it, his spoils (salab) are his." No one said "over a captive" in it except Hushaym.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12859