Musnad Ahmad 32:272

Waki’ narrated to us, Hammad bin Salamah narrated to us, from Thabit, from Anas bin Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I have been harmed for the sake of Allah, and no one is harmed [as I have been]. And I have been frightened for the sake of Allah, and no one is frightened [as I have been]. And there came upon me three days and nights, and neither I nor Bilal had any food that a living creature could eat, except for what Bilal could conceal under his armpit."