"Indeed a disbeliever's skin will be forty-two forearm lengths thick, his molar teeth will be like Uhud (mountain), and his sitting place in Hell will be like what is between Makkah and Al-Madinah."  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ غِلَظَ جِلْدِ الْكَافِرِ اثْنَانِ وَأَرْبَعُونَ ذِرَاعًا وَإِنَّ ضِرْسَهُ مِثْلُ أُحُدٍ وَإِنَّ مَجْلِسَهُ مِنْ جَهَنَّمَ كَمَا بَيْنَ مَكَّةَ وَالْمَدِينَةِ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ مِنْ حَدِيثِ الأَعْمَشِ  

[Machine] From the Prophet ﷺ , he said, "The thickness of the skin of the disbeliever is forty-two arm lengths in comparison to the arm length of the Almighty, and his tooth is equivalent to the mountain of Uhud."  

عَنِ النَّبِيِّ ﷺ قَالَ «إِنَّ غِلَظَ جَلْدِ الْكَافِرِ اثْنَانِ وَأَرْبَعُونَ ذِرَاعًا بِذِرَاعِ الْجَبَّارِ وَضِرْسُهُ مِثْلُ أُحُدٍ»