I saw the Messenger of Allah ﷺ say, "The sun will draw close to the earth, and people will sweat. Some will have sweat reaching their ankles, some up to the middle of their shins, some up to their knees, some up to their buttocks, some up to their waists, some reaching their necks, and some up to the middle of their mouths." He gestured with his hand, putting it across his mouth like a bridle.The narrator said, I saw the Messenger of Allah ﷺ gesture like this. "And some will be completely covered by their sweat," and he struck with his hand to demonstrate.
رأيت رسول الله ﷺ يقول: تدنو الشمس من الأرض، فيعرق الناس، فمن الناس من يبلغ عرقه كعبيه، ومنهم من يبلغ إلى نصف الساق، ومنهم من يبلغ إلى ركبتيه، ومنهم من يبلغ إلى العجز، ومنهم من يبلغ إلى الخاصرة، ومنهم من يبلغ عنقه، ومنهم من يبلغ وسط فيه، وأشار بيده فألجم فاه، قال: رأيت رسول الله ﷺ يشير هكذا ومنهم من يغطيه عرقه، وضرب بيده إشارة.
Tabarani narrated it in Al-Kabir (17/302), Ibn Hibban (7329) - and this is his wording -, and Hakim (4/571), all of them through routes from Ibn Wahb, who said, Amr bin Harith informed me, that Abu Ashana told him, that he heard Uqba bin Amir say... and then he mentioned it. Its isnad is sahih. Hakim said, "This is a hadith sahih in isnad."