Sahih Bukhari
To make the Heart Tender (Ar-Riqaq)
Volume: 008 / Book Number: 076 / Hadith Number: 539
Narrated Abu Huraira :
Allah's Apostle said, "The people will sweat so profusely on the Day of Resurrection that their sweat will sink seventy cubits deep into the earth, and it will rise up till it reaches the people's mouths and ears."