Abu Hurairah reported,

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 journey of three days."

Azami 12168

Sahih

عن أبي هريرة قال

قال رسول الله ﷺ: ضرس الكافر أو ناب- الكافر- مثل أحد، وغلظ جلده مسيرة ثلاث.

الأعظمي 12168صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Tafsir of the great Quran
Chapter
Virtues of Surah Baqarah
Section
His saying, "Indeed, those who disbelieve in Our verses, We will drive them into a fire. Every time their skins are roasted through, We will replace them with other skins so they may taste the punishment. Indeed, Allah is Exalted in Might and Wise. And those who believe and do righteous deeds, We will admit them to gardens beneath which rivers flow, wherein they abide forever. For them therein are purified spouses, and We will admit them to dense shade"
Numbering
Jami al-Kamil 12168 (2nd edition)
Azami 12168