Salim bin Abdullah narrates from his father (Abdullah bin Umar (may Allah be pleased with them both)) that he said: We met the enemy with the Messenger of Allah (peace and blessings be upon him). I speared a man and killed him, and the Messenger of Allah (peace and blessings be upon him) gave me his belongings.
This is gharib (singular) with this chain, and it has been narrated through another, weak route.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12767