It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: In Hell, the place where a disbeliever sits will be spread out to the distance of a three-day journey. Each molar tooth will be as large as Mount Uhud, the thighs will be as large as Mount Wurqan, and after removing the flesh and bones, only the skin will be forty cubits thick.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11232
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف لضعف دراج فى روايته عن أبى الهيثم، وابن لهيعة متابع