The Prophet ﷺ said, "The disbeliever will be made enormous, so much so that his molar will be larger than Mount Uhud, and the size of his body in proportion to his molar will be like the size of one of your bodies in proportion to his molar."
حدثنا أبو بكر بن أبي شيبة حدثنا بكر بن عبد الرحمن حدثنا عيسى بن المختار عن محمد بن أبي ليلى عن عطية العوفي
عن النبي ﷺ قال إن الكافر ليعظم حتى إن ضرسه لأعظم من أحد وفضيلة جسده على ضرسه كفضيلة جسد أحدكم على ضرسه
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[Its isnad is daif] Busiri graded it daif due to two flaws, see hadith nos. 37 and 854 and others.Zayd bin Arqam said in his hadith, "The man from the people of Hellfire will be enlarged for the Fire until one of his molars becomes like Uhud" (Ahmad, 4/367, its isnad is sahih, and its origin is found in Sahih Muslim, hadith 2408).It is also reported in Sahih Muslim, hadith 2851, that the Messenger of Allah said, "The molar of the disbeliever," or "the canine tooth of the disbeliever," "is like Uhud, and the thickness of his skin is a three-day journey."