[13].Surah Ar-Ra'd [The Thunder] : Ayat 31

Ayat 31. And if there had been a Qur'an with which mountains could be moved (from their places), or the earth could be cloven asunder, or the dead could be made to speak (it would not have been other than this Qur'an). But the decision of all things is certainly with Allah. Have not then those who believe yet known that had Allah willed, He could have guided all mankind? And a disaster will not cease to strike those who disbelieve because of their (evil) deeds or it (i.e. the disaster) settle close to their homes, until the Promise of Allah comes to pass. Certainly, Allah does not fail in His Promise. 

Hazrat Auf bin Malik (May Allah be pleased with him) reported: Messenger of Allah  [SAWW](PBUH) said, "The best of your rulers are those whom you love and who love you, and those who supplicate Allah in your favour and you supplicate Allah in their favour. 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 who were present): "Should not we oppose them?'' He said, "No, as long as they establish Salat; as long as they establish Salat in your midst.''

[Muslim Book 20, Chapter 17, Hadith # 4573]. 

Lesson : as mentioned above in Surah Ar-Ra'd Ayat 31. "a disaster will not cease to strike those who disbelieve because of their (evil) deeds or it (i.e. the disaster) settle close to their homes," The Hadith identifies two categories of rulers. First, those rulers who are well-wishers of people and provide them with justice. These are the best rulers for whom people also pray. Second, the worst rulers who are only concerned with their rule and interests and take no interest in providing justice to people and removing their difficulties. In fact, rulers are advised to adhere to justice, uprightness and equity as this can endear them to Allah as well as to people.