Narrated 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."
— Sahih Bukhari, Volume 8, Book 82: Punishment of Disbelievers at War with Allah and His Apostle, Hadith #799
