Musannaf Ibn Abi Shayba 36:458

Yazid ibn Harun narrated to us, he said: Ismail ibn Abi Khalid informed us, he said: I saw Abdullah ibn Awfa, and in his hand was a strike (a scar from a wound). I said: "What is this?" He said: "I was struck with it on the day of Hunayn." He said: I said to him: "And did you witness Hunayn with the Messenger of Allah, may Allah bless him and grant him peace?" He said: "Yes."