Amirate – Ibn Rajab al-Hanbali

Al-Hasan said about amirs, “They take charge of five of our affairs: the Jumu’ah and the congregational prayer [jama'ah], the ‘Id, the frontiers, and the hadd punishments. By Allah! the deen will only be straight and effective by them, even if they are tyrannical and wrongdoing. By Allah! that which Allah puts right by means of them is more than that which they corrupt, although, by Allah! obedience to them is tough, but separating oneself from them is kufr.”
Al-Khalal narrated in the “Kitab al-Imarah –Book of Amirate” from the hadith of Abu Umamah that he said, “The Prophet, may Allah bless him and grant him peace, commanded his companions when they had prayed ‘Isha’, ‘Assemble, because I have need of you.’ When they finished the morning prayer, he asked, ‘Have you assembled as I told you?’ They answered, ‘Yes.’ He said three times, ‘Worship Allah and do not associate anything with Him! Have you grasped this?’ We answered, ‘Yes.’ He said three times, ‘Establish the prayer and produce the zakah! Have you grasped this?’ We answered, ‘Yes.’ He said three times, ‘Hear and obey!’ He said three times, ‘Have you grasped this?’” He said, “We had thought that the Messenger of Allah, may Allah bless him and grant him peace, was going to give a long discourse, but then [we saw] that he had collected together the entire affair for us.”
(Ibn Rajab al-Hanbali, Jami’ al-’ulum wa’l-hikam translated by Abdassamad Clarke and published by Turath Publishing Ltd., as The Compendium (of knowledge and wisdom). In commentary of hadith no.28, p.707)