Musnad Ahmad 32:1280

'Abd al-Samad narrated to us, 'Ammar Abu Hashim, the companion of al-Za'farani, narrated to us, from Anas ibn Malik, that Fatimah handed the Messenger of Allah, may Allah bless him and grant him peace, a piece of barley bread. He said: "This is the first food your father has eaten in three days."