Jami` at-Tirmidhi, Book 39, Hadith 2778 (In-Book) ⓘ
Abu Hurairah narrated that the Prophet (s.a.w) said: "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."
حَدَّثَنَا عَبَّاسٌ الدُّورِيُّ، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى، أَخْبَرَنَا شَيْبَانُ، عَنِ الأَعْمَشِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم 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 .
also referenced under: Hadith 2577 (Reference) & Volume 4, Book 37, Hadith 2577 (DarusSalam)