Sahih Muslim Book 020, Hadith Number 4524.

Chapter : Obedience to the ruler is forbidden in matters sinful, but is otherwise obligatory.

It has been narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) said: It is obligatory for you to listen to the ruler and obey him in adversity and prosperity, in pleasure and displeasure, and even when another person is given (rather undue) preference over you.

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