It is narrated from Sayyiduna Abu Umamah al-Bahili (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "On the Day of Resurrection the sun will draw near to a distance of a mile, and its heat will be increased by such and such, so that people will boil as pots boil upon the stove. They will sweat in it according to their sins: for some the sweat will reach their ankles, for some their shins, for some their waists, and for some the sweat will reach their mouths like a bridle."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7748