From Sahih al Bukhari
Book 020, Number 4573:
It has been narrated on the authority of 'Auf b. Malik that the Messenger
of
Allah (may peace be upon him) said: The best of your rulers are those whom
you love and who love you, who invoke God's blessings upon you and you
invoke His blessings upon them. And the worst of your rulers are those whom
you hate and who hate you and whom you curse and who curse you. It was asked
(by those present): Shouldn't we overthrow them with the help of the sword?
He said: No, as long as they establish prayer among you. If you then find
anything detestable in them. You should hate their administration, but do
not withdraw yourselves from their obedience.
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