Sahih Muslim
The Book Pertaining to Piety and Softening of Hearts (Kitab Al-Zuhd wa Al-Raqaiq)
Book Number: 042 / Hadith Number: 7093
'Urwa b. Zubair reported on the authority of 'A'isha, the wife of Allah's Apostle (may peace be upon him), that she said: Allah's Messenger (may peace be upon him) died (in a state) that it never happened that he could eat to his fill the bread with olive oil twice during a day.