Once Hajjaaj the tyrant who was responsible for the murder of numerous Sahaabah said to Hadhrat Anas (radhiyallahu anhu): “Is there any difference between my horses and the horses of Rasulullah (sallallahu alayhi wasallam)?” Hadhrat Anas (radhiyallahu anhu) replied: “There is the difference of heaven and earth because there was thawaab even in the urine and manure of the horses of Rasulullah (sallallahu alayhi wasallam) while you are keeping horses for show and pride.”

Greatly annoyed by this answer, Hajjaaj said: “If it was not for the pledge I had given to Ameerul Mu’mineen (the then Khalifah of the Islamic empire), I would have killed you this very moment.” Hadhrat Anas (radhiyallahu anhu) said: “By virtue of such a dua taught to me by Rasulullah (sallallahu alayhi wasallam). I have neither fear for any tyrannical oppressor nor for any shaitaan nor for any beast.Hajjaaj said: “Teach that dua to my son.” Hadhrat Anas (radhiyallahu anhu) said: “I shall never teach it because he is not qualified for it.”
(Nazhatul Majaalis)