Musnad Ahmad 32:296

Yazid narrated to us, Hammad ibn Salamah informed us, from Ishaq ibn Abdullah ibn Abi Talhah, from Anas ibn Malik, that the Messenger of Allah (peace and blessings of Allah be upon him) said on the day of Hunayn: "Whoever kills a man, he shall have his spoils." Abu Talhah killed twenty men on that day and took their spoils.