The Messenger of Allah ﷺ said, "The molar of the disbeliever, or the canine tooth of the disbeliever, will be like Mount Uhud, and the thickness of his skin will be a three-day journey."
قال رسول الله ﷺ: ضرس الكافر-أو ناب الكافر- مثل أحد، وغلظ جلده مسيرة ثلاث.
Muslim narrated it in the Book of Paradise and its Bliss (2851) from Surayj bin Yunus, who said, Humayd bin Abdul-Rahman told us, from Hasan bin Salih, from Harun bin Saad, from Abu Hazim, from Abu Hurairah, who mentioned it.