The Messenger of Allah ﷺ said, "The seat of the disbeliever in the Fire is a distance of three days' journey, each of his molars is like Mount Uhud, his thigh is like Mount Warqan, and his skin, apart from his flesh and bones, is forty cubits thick."
حدثنا حسن حدثنا ابن لهيعة حدثنا دراج عن أبي الهيثم
عن رسول الله ﷺ قال مقعد الكافر في النار مسيرة ثلاثة أيام وكل ضرس مثل أحد وفخذه مثل ورقان وجلده سوى لحمه وعظامه أربعون ذراعا
Its chain of transmission is hasan, due to Ibn Lahia and Darraj, and Hasan here is Ibn Musa. Hakim graded the hadith sahih in 3/598, and Dhahabi agreed with him.11176m - And from the Messenger of Allah ﷺ, he said, "If an iron mace were placed on the earth, and the two weighty ones, jinn and mankind, gathered together for it, they could not lift it from the earth." Hasan(11176m) Its chain of transmission is hasan, like the one before it. Tirmidhi has the hadith with similar wording, number 2584, and he graded it daif, but Hakim graded it sahih in 4/600, and Dhahabi agreed with him.