Musnad Ahmad 769:30

Yazid ibn Harun narrated to us, Ismail informed us, from Abdullah ibn Abi Awfa, who said: The Prophet, peace and blessings of Allah be upon him, performed Umrah, so he circumambulated the House, and we circumambulated with him. He prayed behind the Maqam, and we prayed with him. Then he went out and performed the circumambulation between al-Safa and al-Marwah, and we were with him, shielding him from the people of Makkah so that no one would throw anything at him or strike him with anything. He said: He supplicated against the Confederates (al-Ahzab), saying: "O Allah, Revealer of the Book, Swift in reckoning, Defeater of the Confederates, O Allah, defeat them and shake them." He said: I saw a wound on his forearm, so I said: "What is this?" He said: "I was struck with it on the day of Hunayn." I said to him: "Did you witness Hunayn with him?" He said: "Yes, and before that."