The Justice of God, known in Islamic theology as “al-Adalah” is considered by Shi’a theologians to be a Key Pillar of Islam (one of the Usul al-Din).
It is argued by theologians and philosophers that since Allah (s.w.t) is the greatest conceivable perfect being, and since justice is an attribute of perfection, Allah (s.w.t) must, by definition, always act within a just framework. All other Islamic beliefs stem from the concept of Allah’s (s.w.t) justice, including the sending of Prophets and Imams to mankind.
Whilst the Justice of Allah (s.w.t) is a doctrine which is clearly and explicitly taught in the Qur’an, many Sunni theologians have generally disagreed with the Shi’a on the nature of Divine Justice and have contended instead that Allah (s.w.t) is not subject to higher moral standards and therefore could commit acts of injustice against human beings. These acts of injustice would therefore become just acts due to the fact that Allah (s.w.t) is the moral standard.
Shi’a would reject such a notion as justice is naturally an attribute of perfection and injustice is an act of imperfection.
They have also stipulated that God would have no need to act unjustly as injustice is a trait which only fallible beings would have the recourse to commit.