Musnad Ahmad 31:670

Harun ibn Ma'ruf narrated to us, Abdullah ibn Wahb narrated to us, from Amr ibn al-Harith, from Darraj, from Abu al-Haytham, from Abu Sa'id, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There is no forbearing person except one who has stumbled, and there is no wise person except one who has experience."