To make the Heart Tender (Ar-Riqaq)
Bukhari :: Book 8 :: Volume 76 :: Hadith 481
Narrated Sahl bin Sa'd:
Allah's Apostle said, "Whoever can guarantee (the chastity of) what is between his two jaw-bones and what is between his two legs (i.e. his tongue and his private parts), I guarantee Paradise for him."
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