Suraij ibn Yunus narrated to me, Humaid ibn Abd al-Rahman narrated to us, from al-Hasan ibn Salih, from Harun ibn Sa'd, from Abu Hazim, from Abu Hurairah, who said: The Messenger of Allah, peace and blessings be upon him, said: "The molar of the disbeliever—or the canine of the disbeliever—is like Uhud, and the thickness of his skin is a journey of three days."