Musannaf Ibn Abi Shayba 28:556

Yazid ibn Harun narrated to us, he said: Hammad ibn Salamah informed us, from Ishaq ibn Abdullah ibn Abi Talha, from Anas, that the Messenger of Allah (may Allah bless him and grant him peace) said on the day of Hunayn: "Whoever kills a person, for him is his spoils." So Abu Talha killed twenty men on that day, and he took their spoils.