One of the main things for a good ruler is justice. It can be said that no issue in Islam is as important as the issue of justice. The justice is one of the major principles of religion, and also is one of the firm ideological foundations of the Muslims. “God commands justice, the doing of good…” (The Holy Qur’an, 16:90)
It is not surprising to realize that justice has been recognized as a factor of sustaining a rule. The Prophet Muhammad (Peace Be Upon Him And His Progeny) said: “Rule can be sustained with unbelief, but it can never last with oppression.” (Al-Amali, p.310)
A just ruler must act similar to a kind father, must not violate people’s rights and must treat everyone under his rule equally.
This was put into practice during the rule of Imam Ali (the first Imam of Muslims) and the Imam made the following recommendations to Malik al-Ashtar in his well-known letter to him: “Let your heart harbor feelings of mercy for your subjects, and love and kindness for them. Do not be like a rapacious beast of prey against them, seizing them in order to devour them, for people are in two groups: either they are your brothers in religion or they are equal to you in creation.” (Nahjul balagha, letter no.53)
However, Islam has invited all men to justice especially rulers.