Sahih Al Bukhari – Book of Good Manners And Form (Al-Adab)

Volumn 008, Book 073, Hadith Number 118.
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Narated By Samura bin Jundub RA : The Prophet PBUH said, "I saw (in a dream), two men came to me." Then the Prophet narrated the story (saying), "They said, 'The person, the one whose cheek you saw being torn away (from the mouth to the ear) was a liar and used to tell lies and the people would report those lies on his authority till they spread all over the world. So he will be punished like that till the Day of Resurrection.'"

comments: One of the greatest advantage of telling the truth is that you dont have to remember what you have said.