To make the Heart Tender (Ar-Riqaq)

Bukhari :: Book 8 :: Volume 76 :: Hadith 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."