Musnad Abu Ya'la al-Mawsili 150:36

Ishaq narrated to us, Hajjaj narrated to us, from Isra'il, from Abu Ishaq, from Abd al-Rahman ibn Yazid, from al-Aswad, from Aisha, who said: The family of Muhammad never ate their fill of barley bread for lunch and dinner for three consecutive days until he passed on to Allah.