Abu Musa told that when God’s Messenger sent one of his companion’s to attend to some of his affairs he said, “Gladden people and do not scare them; make things easy and do not make them difficult. ’
Abu Burda* told that when the Prophet sent his grandfather Abu Musa and Mu'adh to the Yemen he said, “Make things easy and do not make them difficult; gladden and do not scare; comply with one another and do not disagree.”
(Bukhari and Muslim.)
* This should be Sa'id b. Abu Burda on his father’s authority. C f. Bukhari, Maghazi, 60.
Abud Darda’ reported God’s Messenger as saying that God most high says, "I am God than whom there is no god, Master of kings, King of kings, in whose hands are the hearts of kings. When men obey me I turn the hearts of kings to them with mercy and gentleness, but when they disobey me I turn their hearts against them with displeasure and vengeance, and they inflict grievous punishment upon them. So do not occupy yourselves with invoking curses on kings, but occupy yourselves with remembrance of me and supplication that I may protect you against your kings.”