Musnad Ahmad 30:1291

Abu al-Nadr narrated to us, Abd al-Rahman—meaning Ibn Abdullah ibn Dinar—narrated to us, from Zayd ibn Aslam, from Ata ibn Yasar, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The molar of the disbeliever is like Uhud, and his thigh is like al-Bayda', and his seat in the Fire is as the distance between Qudayd and Makkah, and the thickness of his skin is forty-two cubits by the cubit of the Compeller (al-Jabbar)."