Praise be to Allah.
The hadeeth about the rulers being from Quraysh is a saheeh hadeeth which was narrated through many isnaads. The basic principle is that the leader should be from Quraysh. But in the case where the khaleefah has seized power by force and is ruling the people by force, the people have to obey him and it is haraam to rebel against him, even if he is an Abyssinian slave as it says in the hadeeth.
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