The Prophet (PBUH) said, "Whoever guarantees me (the chastity of) what is between his legs, and what is between his jaws ( i.e., his tongue), I guarantee him Paradise."
Sahih Al-Bukhari Hadith 8.799 Narrated by Sahl bin Sad
Sahih Al-Bukhari Hadith 8.799 Narrated by Sahl bin Sad