Musnad Ahmad 1153:2045

Rawh narrated to us, Malik narrated to us, from Abu al-Aswad Muhammad ibn Abd al-Rahman ibn Nawfal—and he was an orphan under the guardianship of Urwah ibn al-Zubayr—from Urwah ibn al-Zubayr, from Aisha: "That the Messenger of Allah (peace and blessings of Allah be upon him) performed Hajj in isolation (ifrad)."