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." (TR)
English reference (TR): Vol. 4, Book 13, Hadith 2577 (TR)
Arabic reference (TR): Book 39, Hadith 2778 (TR)