Sahih Muslim 2851
Sahih Muslim · Book 53: The Book of Paradise, its Description, its Bounties and its Inhabitants · The Arrogant Will Enter The Fire, And The Humble Will Enter Paradise
It is transmitted on the authority of Abu Huraira that Allah's Messenger (ﷺ) said:
حَدَّثَنِي سُرَيْجُ بْنُ يُونُسَ ، حَدَّثَنَا حُمَيْدُ بْنُ عَبْدِ الرَّحْمَنِ ، عَنِ الْحَسَنِ بْنِ صَالِحٍ ، عَنْ هَارُونَ بْنِ سَعْدٍ ، عَنْ أَبِي حَازِمٍ ، عَنْ أَبِي هُرَيْرَةَ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " ضِرْسُ الْكَافِرِ أَوْ نَابُ الْكَافِرِ مِثْلُ أُحُدٍ وَغِلَظُ جِلْدِهِ مَسِيرَةُ ثَلاَثٍ " .
The molar tooth of an unbeliever or the canine teeth of an unbeliever will be like Uhud and the thickness of his skin a three night's journey.