To make the Heart Tender (Ar-Riqaq)

Bukhari :: Book 8 :: Volume 76 :: Hadith 530

Narrated Anas bin Malik:

A man said, "O Allah's Prophet! Will a Kafir (disbeliever) be gathered (driven prone) on his face?" The Prophet said, "Is not He Who made him walk with his legs in this world, able to make him walk on his face on the Day of Resurrection?" (Qatada, a sub-narrator said: Yes, (He can), by the Power of Our Lord!")