Sahih Bukhari Volume 008, Book 082, Hadith Number 799.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 82. Punishment of Disbelievers at War with Allah and his Apostle
Narrated By Sahl bin Sa'd : The Prophet said, "Whoever guarantees me (the chastity of) what is between his legs (i.e. his private parts), and what is between his jaws (i.e., his tongue), I guarantee him Paradise."