It is narrated from Sayyiduna al-Miqdam (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 the people until it is at a distance of two miles from them, and its heat will increase so that it scorches them. They will be immersed in sweat according to their deeds: for some the sweat will reach their ankles, for some their knees, for some their waists, and some will be completely bridled by sweat (that is, it will reach their mouths)." He said: And I saw the Messenger of Allah (peace and blessings be upon him) pointing with both his hands towards his mouth. Ibrahim bin Irq said: Umar bin Khath'am narrated it like this from Sulaym, from al-Miqdam.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17800