Musnad Ahmad 28:318

Isma'il ibn 'Umar Abu al-Mundhir narrated to us, Yunus ibn Abi Ishaq narrated to us, 'Abdullah ibn Abi al-Safar narrated to me, from al-Sha'bi, from 'Abd al-Rahman ibn 'Abd Rabb al-Ka'bah al-Sa'idi, who said: I saw a group at the Ka'bah, so I leaned toward them, and behold, there was a man speaking to them, and behold, it was 'Abdullah ibn 'Amr. He said: We went out with the Messenger of Allah, may Allah bless him and grant him peace, on a journey, and we descended at a place, and he mentioned the hadith.