‘Abdallah b. ‘Amr reported God’s Messenger as saying, “If anyone gives his brother a look which frightens him, God will frighten him on the day of resurrection.”
‘Umar b. al-Khattab reported God’s Messenger as saying, “The one among God’s servants who will have the best position with God on the day of resurrection will be a just and kindly iman, but the man who will have the worst position with God on the day of resurrection will be a tyrannical and harsh imam.”
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.”
Ibn ‘Umar reported the Prophet as saying, “The sultan is God’s shade on the earth to which each one of His servants who is wronged repairs. When he is just he will have a reward, and it is the duty of the common people to be grateful; but when he acts tyrannically the burden rests on him, and it is the duty of the common people to show endurance.”