It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "The people of Hell will be made enormous in the Fire, until the distance between the earlobe of one of them and his shoulder becomes the distance of a seven-hundred-year journey, the thickness of his skin will be forty cubits, and his molar tooth will be bigger than Mount Uhud." And the wording of both narrators is the same.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13425