The Quran repeatedly underscores justice as an intrinsic attribute of Allah and a core commandment for humanity. Allah's command to 4:58 highlights its universal application. This divine mandate for justice is not merely an abstract ideal but a practical framework for all human interactions. Ibn Kathir explains that this verse serves as a general command encompassing everyone, from the common people to those in authority, to fulfill trusts and judge justly.

The Quran clarifies that justice extends to the sanctity of life and property. Believers are solemnly reminded of the covenant: 2:84. This injunction, originally given to the Children of Israel, is echoed in its broader implications for the Muslim Ummah. Ma'arif-ul-Quran explains that this covenant was willingly taken and explicitly stated. Transgressing against another's life or property is thus a violation of a fundamental divine contract. Allah further warns against “consuming one another's wealth unjustly”, which includes theft, robbery, fraud, bribery, and even unjust rulings obtained through legal means. As-Suddi, from Ibn Abbas and Ibn Masud, elucidates that "unjustly" (بالباطل) in this context refers to all illicit means, such as usury, gambling, and false transactions.

Justice is intricately linked with belief (`Iman) and righteous deeds (Amal Salih). Tafsir al-Jalalayn describes the God-fearing (Muttaqin) as those who adhere to commands and avoid prohibitions, thereby guarding themselves from the Fire. Ibn Kathir further elaborates on the meaning of `Iman as trust and belief, which includes affirming Allah, His Books, and His Messengers, and realizing this affirmation through adherence to implications of what the tongue utters and affirms. The Quran presents two qualities of the God-fearing: steadfastness in Salah and spending in the way of Allah who believe in the unseen, and are steadfast in Salah and spend out of what We have provided them. This highlights that sincere faith is incomplete without righteous conduct, particularly social justice through charitable giving. Ma'arif-ul-Quran emphasizes that "Iman is not valid without Islam, nor Islam without Iman." The connection between faith and action is crucial, as deeds done without true faith or that contradict Islamic law are deemed unacceptable by Allah.

The Prophet Muhammad ﷺ exemplified the principles of justice in his leadership and daily life, serving as the ultimate arbiter among people. Allah revealed the Quran to him 4:105. This signifies that the Prophet's judgments were divinely guided, establishing an impeccable standard. However, the Prophet ﷺ, being human, also taught his followers that human judges base their decisions on apparent evidence. He stated, "Verily, I am only human and I judge based on what I hear. Some of you might be more eloquent in presenting his case than others, so that I judge in his favor. If I judge in one's favor concerning the right of another Muslim, then it is a piece of the Fire. So let one take it or leave it" (Bukhari 37:10; Muslim 22:41, 55:23). This hadith, commented on by Ibn Kathir, underscores that a judge's ruling, while legally binding in this world, does not alter the underlying truth of a matter in Allah's sight. Therefore, one who obtains a ruling unjustly still bears the sin.

The Prophet's decisions consistently upheld fairness, even in matters of property and family. When a man expressed concern about the distribution of wealth, claiming it was not done justly, the Prophet ﷺ responded with "Woe to you! Who could do justice if I did not? I would be a desperate loser if I did not do justice" (Bukhari 61:117, 65:189). This highlights that justice is not merely a preference but a core responsibility for those in authority. The Prophet also explicitly instructed, "Have Taqwa of Allah and treat your children equally" when a father sought him as a witness to a gift for one child, refusing to be a witness to injustice Muslim 5:8. This Hadith, as cited in Tafsir Ibn Kathir, illustrates the meticulous concern for equity in family matters.

In times of conflict, the Prophet's guidance emphasized proportionality and the avoidance of aggression. Muslims were commanded to 2:190. This verse, revealed in Madinah, marks the beginning of legislation for fighting, restricting it to combatants and prohibiting the killing of non-combatants like women, children, the elderly, priests, and laborers, unless they actively participate in warfare. Al-Hasan Al-Basri explains that "transgression" includes mutilating the dead, theft from captured goods, and killing those not engaged in fighting. The Quran further clarifies that 16:126.

Islamic teachings extend justice beyond legal frameworks to encompass individual ethics and social harmony. The Quran describes those who `believe in the unseen as performing Salah and spending from what Allah has provided them. This comprehensive definition of faith emphasizes both ritual worship and social responsibility. Neglecting financial obligations and hoarding wealth are severely condemned, with Allah warning those who are niggardly and bid other people to be niggardly. Such behavior is equated with ungratefulness to Allah's bounties and merits a disgraceful torment. Abu Hurairah narrated that the Prophet ﷺ said, "Every morning two angels descend. One of them says: 'O Allah, bless him who spends in the way of good'; and the other says: 'O Allah, send destruction on (the wealth of) the miser'" (Bukhari, Muslim).

The protection of vulnerable groups, particularly orphans, is a recurrent theme in the Quran. Guardians are strictly warned: do not consume it excessively and quickly, [anticipating that they will grow up]. This means guardians should not hasten to spend an orphan's wealth in anticipation of losing control over it. Furthermore, consuming an orphan's property unjustly is declared a great sin. Allah states, Verily, those who unjustly eat up the property of orphans, they eat up only a fire into their bellies, and they will be burnt in the blazing Fire!. This stern warning, elaborated by Ibn Kathir, signifies that such ill-gotten gains are literally fire in the afterlife. The Prophet ﷺ listed consuming an orphan's property as one of the "seven great destructive sins" (Bukhari 4:9; Muslim).

Justice also mandates transparency and truthfulness in all dealings, especially financial transactions. The longest verse in the Quran commands believers to write it down. And let a scribe write [it between you in justice] when contracting a debt for a specified term. This ensures clarity and prevents disputes. Ma'arif-ul-Quran explains that writing is crucial for evidence and to avoid ambiguity. Witnesses are also enjoined: 2:282 disobedience in you]. Refusing to bear witness when called upon is a sin, as testimony is vital for establishing truth and resolving disputes. However, the Quran also protects scribes and witnesses from undue harm, recognizing their essential role in maintaining justice.

Justice is paramount in governance, as Allah commands leaders to 4:58. This verse highlights that positions of authority are divine trusts, and those entrusted with them must act justly. The principle dictates that appointments to public office should be based on merit and capability, not favoritism. Ma'arif-ul-Quran notes that entrusting responsibility to the undeserving is a breach of trust against Allah, His Messenger, and all Muslims. The Prophet ﷺ warned, "When the responsibility of affairs is placed under the charge of those who are not deserving of and fit for it, then, wait for the Day of Doom" (Bukhari, Kitab al-`Ilm).

The Quran instructs believers to be 4:135. This demanding standard emphasizes that personal relationships should never compromise justice. It is further elaborated that 5:8. Ibn Kathir cites the example of Abdullah bin Rawahah, who, despite his animosity towards the Jews of Khaybar, refused to be swayed from justice when collecting taxes from them. This principle ensures that justice is universal and impartial, applying equally to friends and foes.

Furthermore, justice in Islam encompasses maintaining societal order and preventing mischief (fasad). The Quran warns against those who spread disorder in the land, equating such actions with hypocrisy and a deviation from righteousness. Ibn Jarir explains that this mischief includes disobeying Allah, continuing prohibited acts, casting doubt on religion, and supporting disbelievers against believers. The concept of "fisq" (wickedness), meaning "going beyond the circle of obedience to Allah," is applied to disbelievers and habitual sinners alike (Ma'arif-ul-Quran). Conversely, establishing order and peace is achieved through obedience to Allah's commands.

The Islamic understanding of justice culminates in the concept of divine reckoning on the Day of Judgment. Allah assures humanity that “Allah does not wrong anyone even by the weight of an atom”. Every good deed will be multiplied, and evil deeds will be accounted for without any injustice. The concept of weighing deeds on the Day of Judgment is repeatedly affirmed in the Quran and Sunnah, as exemplified by the Prophet's statement that "No deed will be heavier than good morals on the scale of deeds" (Abu Dawud, Tirmidhi).

The Quran also describes the ultimate consequences of justice and injustice in the Hereafter. Those who strive for justice and perform righteous deeds are promised Gardens under which rivers flow, a reward that is eternal and free from sorrow. Conversely, those who disbelieve and commit injustice face a painful chastisement. The hypocrites, who outwardly profess belief but inwardly harbor disbelief, are among the most severely condemned, with Allah describing them as having a sickness in their hearts that will be increased. Their attempts to deceive Allah and the believers only deceive themselves, for Allah is ever Hearing and Seeing of their true intentions.

The emphasis on divine justice serves as a powerful motivator for believers to uphold justice in this life. The knowledge that Allah is All-Knowing, All-Wise in His commands and decrees encourages submission and obedience, even when the wisdom behind certain injunctions may not be immediately apparent. This belief in an ultimate, perfectly just accounting ensures that no action, however small, goes unnoticed or unrewarded, or unpunished.

Justice (`Adl) is a pervasive and indispensable theme in Islam, deeply integrated into its theological, ethical, and legal structures. From the divine commands in the Quran to the practical examples of the Prophet Muhammad ﷺ, it guides individual conduct, shapes societal norms, and underpins the system of governance. The comprehensive framework of justice in Islam aims to establish fairness, protect rights, and foster righteousness in all aspects of life, with the ultimate accountability to Allah serving as a profound motivation for adherence.