Musnad Ahmad 775:13

Yahya narrated to us, from Isma'il, Abdullah ibn Abi Awfa narrated to us, he said: The Messenger of Allah (peace and blessings of Allah be upon him) performed Umrah, so he circumambulated the House. Then he went out and walked between al-Safa and al-Marwah. We began to shield him from the people of Makkah, lest anyone throw something at him or harm him with something. I heard him supplicating 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."