To make the Heart Tender (Ar-Riqaq) 
Bukhari :: Book 8 :: Volume 76 :: Hadith 579
Narrated Ibn 'Umar:
The Prophet said, "There will be a tank (Lake-Fount) in front of you as large as the distance between Jarba and Adhruh (two towns in Sham)."
To make the Heart Tender (Ar-Riqaq)
Bukhari :: Book 8 :: Volume 76 :: Hadith 579
Narrated Ibn 'Umar:
The Prophet said, "There will be a tank (Lake-Fount) in front of you as large as the distance between Jarba and Adhruh (two towns in Sham)."