Hazrat Abu Barzah Aslami (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said three times: The rulers will be from among the Quraysh; when mercy is requested from them, they will show mercy; when they make a promise, they fulfill it; and when they judge, they judge with justice. And whoever does not do so, upon him is the curse of Allah, the angels, and all mankind.