Musnad Ahmad 769:28

Ya'la narrated to us, Isma'il narrated to us, he said: I heard 'Abdullah ibn Abi Awfa saying: "We were with the Messenger of Allah, may Allah bless him and grant him peace, when he performed 'Umrah. He performed Tawaf and we performed Tawaf with him, and he prayed and we prayed with him. He performed Sa'i between al-Safa and al-Marwah, and we were shielding him from the people of Makkah, so that no one would reach him with anything."