Harun Ar-Rashid and the fortune teller

A well-known fortune teller once told Harun Ar-Rashid, the Abbasid caliph, that his life will be cut short.  The caliph was very depressed.  His adviser, Ja`far Al-Barmaki, learned of the matter and summoned the fortune teller to the ruling palace.  He asked him: so you see the life of the caliph to be short?  Yes, said the fortune teller.  What about your life, asked Ja`far.  It will be a long life, said the fortune teller.  Ja`far turned to the caliph and said: kill him at once to prove the falsehood of this prediction.  He was killed at once and the caliph was relieved.