Narrated Anas bin Malik: Allah's Apostle said, "You should listen to and obey, your ruler even if he was an Ethiopian (black) slave whose head looks like a raisin."

Narrated Ibn `Abbas: The Prophet said, "If somebody sees his Muslim ruler doing something he disapproves of, he should be patient, for whoever becomes separate from the Muslim group even for a span and then dies, he will die as those who died in the Pre-lslamic period of ignorance (as rebellious sinners). (See Hadith No. 176 and 177)

Narrated `Abdullah: The Prophet said, "A Muslim has to listen to and obey (the order of his ruler) whether he likes it or not, as long as his orders involve not one in disobedience (to Allah), but if an act of disobedience (to Allah) is imposed one should not listen to it or obey it. (See Hadith No. 203, Vol. 4)

Narrated `Ali: The Prophet sent an army unit (for some campaign) and appointed a man from the Ansar as its commander and ordered them (the soldiers) to obey him. (During the campaign) he became angry with them and said, "Didn't the Prophet order you to obey me?" They said, "Yes." He said, "I order you to collect wood and make a fire and then throw yourselves into it." So they collected wood and made a fire, but when they were about to throw themselves into, it they started looking at each other, and some of them said, "We followed the Prophet to escape from the fire. How should we enter it now?" So while they were in that state, the fire extinguished and their commander's anger abated. The event was mentioned to the Prophet and he said, "If they had entered it (the fire) they would never have come out of it, for obedience is required only in what is good." (See Hadith No. 629. Vol. 5)