The Qur'ān says, “Indeed, God enjoins justice and kindness.” (16:90) Given that the context of this verse pertains to the responsibilities of human beings toward their society, the term ‘justice’ should be interpreted as ‘social justice’. Thus, God has ordered human beings to uphold justice.
'Allāma Ṭabāṭabā'ī has said that social justice denotes treating each member of society in accordance with their merit and ensuring everyone receives their rights. This social quality is an obligation that responsible individuals must observe [1]

The establishment of social justice is one of the most important teachings of divine prophets ('a). Hence they strived to explain its essence and scientific principles, inculcate its spirit within humanity, and compel its acceptance as a cornerstone upon which earthly life depends. Anyone with basic knowledge of religious teachings understands that the establishment of social justice enlivens God's religion. 

Thus, until justice prevails, true religion remains incomplete. Similarly, until universal social justice takes root, the fulfillment of religious and legal obligations remain unattained. [2]

The absence of social justice historically has been the cause of most revolutions. Noble-minded reformers have consistently started their movements with the of establishing social justice and eradicating discrimination. The Prophet (ṣ) said that “Justice in social struggle is like a guardian shield which protects people from oppression; and it is like a stable paradise that perpetually bestows its blessings” [3]

Although it is necessary for everyone to respect one another's rights, it is more important for a leader [to respect human rights]. In this regard, Imām 'Alī ('a) told his commanders that neglecting people's rights equates to ruin [4]. Additional, Imām Riḍā ('a) said that the Household (Ahl al-Bayt) of the Prophet (ṣ) are guardians and protectors of the believers' rights [5]

However, it is not solely leaders who must foster social justice; Islām has said both leaders and followers possess rights. Social justice can only thrive when everyone's rights are upheld. Imām 'Alī ('a) said that mutual respect between leaders and followers results in the elevation of righteousness, the revelation of religious principles, and the solidification of just characteristics.[6]

Characteristics of Social Justice

1.    Meritocracy

One of the most important characteristics of social justice is meritocracy, which means entailing the assignment of roles and responsibility based on individual merit. Justice mandates that the most qualified individuals are given precedence for opportunities and higher positions. 

Imām 'Alī ('a) instructed Mālik Ashtar to appoint individuals to different positions in accordance with their merit (Nahj al-Balāgha, letter to Malik Ashtar). The Prophet (s) emphasized that it is treachery to appoint less qualified people to positions of authority [7]

2.    Prioritizing the Rights of the Impoverished and Needy

Another characteristic of social justice is paying attention to the rights of the poor and needy. Injustice is a contributing factor to poverty, which in turn breeds various hardships. Luqman said that of all the bitterness he had encountered, poverty was the harshest. The Prophet (s) said that poverty, pain, enmity, and fire are never trivial [8], and that poverty represents a significant form of death [9]

These reports show that leaders have heavy responsibilities, because the poor need justice more than other people. 

3.    Respecting People's Rights 

When oppression becomes prevalent in society, leaders should not merely distance themselves from it; they ought to stand up and fight for the rights of the oppressed. In fact, all individuals must resist remaining silent when others endure oppression, as passivity equates to complicity in oppression.

Furthermore, not only oppression destroys everything, including culture, economics, wisdom, ability, talent, innovation, etc. but also it is the biggest obstacle to establish justice within society. Imam 'Alī ('a) asserted that ending oppression is a prerequisite for justice.

4.    Equity and Impartiality

It has been reported that one day a rich man and a poor man were sitting next to each other. The rich man pulled his face at the poor man and adjusting his clothes. Observing this the Prophet (ṣ) asked the rich man “Are you afraid that some of his poverty will be transmitted to you?” [10]

The Prophet (s), both in words and acts, paid attention to this important characteristic. For example, when a woman from the Banī Makhzūm tribe committed theft and the people asked the Prophet (s) to judge, her family, who were still influenced by the customs of the class system, considered execution of punishment to be shameful for their aristocratic family. As a result, they started looking for ways to prevent the punishment. To this end, they coerced Usama ibn Zayd, whom the Prophet (s) held in deep affection, to intercede with the Prophet (s) and halt the punishment. However, scarcely had Usama begun to speak when the Prophet (s) grew angry and said no one should stop him from implementing God's laws. Usama promptly sought forgiveness. Later that day, the Prophet (s), aiming to dispel any perception of favoritism, addressed the incident in a speech. He said “Throughout history, tribes and nations declined and vanished due to favoritism in justice’s administration. When both an aristocrat and a commoner committed the same crime, they would punish the commoner while granting impunity to the aristocrat. I swear by the God in whose hands hold my life that I shall spare no one from punishment, regardless of their social standing, whether high or low” [11]

On a different occasion, when Umm Hānī, Imām Alī's sister, went to see him, the Imam gave her twenty dirhams. When she asked her non-Arab bondswoman about her received amount, the female slave said she had also been given twenty dirhams. Incensed by this equality, Umm Hānī confronted her brother, Imam Ali, in protest. In response, the Imam sent her back with these words: “Go back, and may God forgive you. In the Book of God, we have not found any preference for Ishmael over Isaac” [12]

5.    Distinction between the Benevolent and the Malevolent

A leader must avoid treating benevolent and malevolent individuals equally, as this engenders injustice. Imām Alī ('a) instructed Mālik Ashtar to avoid treating benevolent and malevolent individuals equally, because doing so could discourage the benevolent and embolden the malevolent. Instead, everyone should be rewarded according to their deeds.[13]
   

       
          references 

1. (Al-Mīzān fī Tafsīr al-Qur'ān, vol. 24, pp. 243-246).
2. (Al-Ḥayāt, vol. 2, p. 97).
3. (al-Ḥadīth – Riwayāt-e Tarbiyyatī, vol. 2, p. 265). 
4. (Nahj al-Balāgha, letter no. 79)
5. (Musnad al-Imām al-Riḍā, ('a), vol. 1, p. 136). 
6. (Nahj al-Balāgha, sermon no. 216). 
7. (Al-Ta'ajub, p. 59).
8. (Nahj al-Faṣāha, saying no. 252)
9. (Nahj al-Balāgha, saying no. 163).
10. (Majmu'at Waram, vol. 1, p. 214).
11. (Ṣaḥīḥ Bukhārī, vol. 5, p. 152).
12. (Biḥār al-Anwār, vol. 40, p. 106).
13. (Nahj al-Balāgha, letter no. 53). 

The concept of responsibility in Islam includes a wide range of matters. Human beings have certain responsibilities in Islam toward others and themselves. All creatures in this universe are naturally inclined to move toward the perfection considered for each of them. They are created in the most proper form, then, have been provided with the conditions and requirements that God has planned (20:50).

Nonetheless, none of them knows neither the path that they should pave nor the final target; except humans. According to the Quran, human beings are created for specific reasons (23:115), and they have duties and responsibilities (75:36). The most prominent responsibility in Islam that one has is towards God, as explained in the first part of the article. He\she is also responsible towards him\herself. This category of duties is discussed here.

The Rights that One Has Over Him\herself as His/her Responsibility in Islam

According to Imam Sajjad (AS), the duties of every human being towards him\herself are to serve only God by all his\her capabilities and every part of the body; and, to respect the rights of each part of the body [1]. Hence, the responsibilities in Islam of every human being towards him\herself can be divided into spiritual and physical items.

Responsibility in Islam towards the Soul

According to the Quran, God breathed into the human being of His [created] soul after he was proportioned (38:72). This makes the human’s soul of great value in Islam. Accordingly, every individual has certain responsibilities towards his\her valuable soul. These duties can be summarized in one sentence: to utilize the soul in the way of God.

That is to apply all spiritual capacities in the obedience to God and to do what brings bout God’s satisfaction. This requires one to keep the soul alive and pure by practicing what is ordered to or invited to in Islamic teachings like prayer (Salat), fasting (Sawm), pilgrimage (Hajj), etc., also by preventing any harm to the soul such as anxiety, depression, etc. 

The Rights that the Parts of the Body Have and One's Responsibility in Islam toward them

One’s acts and words form and determine the his\her path in life. He\she does various acts (including good deeds, what is obligatory (Wajib) or recommended (Mustahab)) with different parts of the body and verbally thank God (in the form of prayer) with the help of tongue and mouth. Hence, whatever one does concerning the obedience of God depends also on the parts of the his\her body. Therefore, he\she has some responsibilities towards them.

The Rights of the Tongue

Of the rights of the tongue are to [1]:

Avoid foul language and the sins that one might commit with the tongue, such as backbiting (ghibah) and slander. Prophet Muhammad (PBUH) said that: “Do not insult others, this turns them into your enemies” [2], and: “Whoever divulges the flaws and faults of another Muslim, God will reveal his flaws” [3]; 
Accustom it to saying pleasant beneficial words;
Force it to talk nicely and politely (2:83);
Stop it from talking too much and stay silent unless talking is beneficial; “Silence is a door to wisdom, it brings affection and guides to every blessing.” [4], and: "whoever believes in God and the Hereafter should say beneficial words, otherwise stays silent.” [5];
Think about what you are going to say and judge the words before you start talking because a wise person will be judged by his words; “A faithful person … thinks about his words first, and then says those words” [6].

The Rights of the Ears

The ears are like the doors to the heart; they transfer every word with either a positive or negative influence on the heart [1]. Imam Ali (AS) has prevented us from listening to the words without any advantage and benefit as they darken the heart and cause us to be blamed [7]. For example, whoever listens to backbiting is a partner of the backbiter [8]. Hence, one should control the ears to hear only nice and useful words that purify the heart or encourage good behavior [1]. 

To be continued. 

References:

1. Imam Sajjad (AS), Treatise On Rights (Risalat al-Huquq).
2. M. al-Kulaynī, “Al-Kafi”, vol. 2, p. 360.
3. Al-Monzeri, “Invitation and Intimidation”, vol. 2, p. 239.
4. M. al-Kulaynī, “Al-Kafi”, vol. 2, p. 113.
5. M. al-Kulaynī, “Al-Kafi”, Introduction, p. 6.
6. W. al.Hilli, “Tanbih al-khawatir wa nuzhat al-nawazir”, vol. 1, p. 106.
7. “Ghurar Al-Hikam Wa Durar Al-Kalim”, T. 6234.
8.  A. Saberi Yazdi, “Al-Hokm Al-Zahera”, p. 558.