One of the significant aspects of responsibility in Islam is the responsibility towards ourselves and how we treat our bodies and souls. As discussed previously, every Muslim is responsible towards himself.

Since human beings owe their existence to their unique Creature, they should treat themselves as their Creator has commanded. The spiritual responsibilities of a human towards him\herself and some of the duties that one has towards his\her body were discussed in the previous part of this topic. Here, we continue the discussion on the rights of the parts of the body.

The Rights of the Eyes as Your Responsibility in Islam towards Yourself

The eyes are the means of insight and awakening of the heart. Imam Ali (AS) said that a faithful person looks to learn, but a hypocrite looks to amuse [1]. Thus, of the rights of the eyes and one's responsibility in Islam towards them is to lower the gaze from whatever that is unlawful (Haram) and not to look at everything and everywhere around, unless there is a lesson or advice behind [2]. According to Imam Ali (AS), whoever closes the eyes from Haram, his\her heart will be relieved [3].

The Rights of the Legs

The legs are the means to walk towards the right path and to overtake others in doing good deeds. Hence, of the rights of the legs over one and the responsibility in Islam towards them are not going towards what is unlawful (Haram) or what humiliates him\herself [2].

The Rights of the Hands

Of the rights of the hands are not to do what is unlawful (Haram) with them, otherwise one will be punished in the Hereafter for what has committed by his\her hands, and will be blamed by others in this world; not to prevent the hands from doing what God has commanded to; and, to allow the hands to seek what is beneficial and useful for one [2].

The Rights of the Stomach

Of the rights of the stomach are [2]:

To be careful about what you eat (80:24);
Not to eat what is unlawful (Haram), neither a little of it nor too much; 
Not to consider the stomach as a container and not to overeat while ignoring others who suffer from hunger; “eat and drink, but do not waste” (7:31);
To eat moderately even when eating lawful (Halal) foods because eating less is the key to good health [4]; 
Not to forget that overeating makes one bored and lazy and stops him\her from doing good deeds. According to Imam Ali (AS), to eat less enlightens the mind [5];
To remember that drinking too much will also cause indiscretion and absurdity; 

The Rights of the Private Parts

Of the rights of the private parts are to protect them from what is unlawful (Haram). To do so, one requires lowering the gaze since the eyes affect the heart and mind greatly. Also, one should frequently remember the death and the afterlife. He\she should always have a fear of the divine punishment and ask God to help him\her to protect his\her private parts from sins [2]. 

The Physical Rights of the Body as the Responsibility in Islam towards Oneself

Every human being is composed of a body and a soul. These two, together, help one to live a natural life. The health of the body is as important as the health of the soul. Devoting everything in life to prepare for the afterlife and depriving oneself of the God’s blessings in this world is blamed in Islam. In Surah Qasas verses 77, Muslims are advised to apply the capabilities and wealth that they have been given to do good deeds and to gain rewards for the afterlife.

But, they should also consider and benefit from the blessings of this world (28:77). Indeed, it is possible to consider both the physical needs as well as spiritual ones simultaneously. Although fulfilling the physical needs is known to be important in Islam, one should keep a balance in life and avoid being luxury-oriented. Otherwise, he\she will always be busy to increase his\her wealth, and this might force him\her to unlawful (Haram) ways of raising money.  

References:

1. S. al-Harrani “Tuhaf al-Uqul”, p. 212.
2. Imam Sajjad (AS), Treatise On Rights (Risalat al-Huquq).
3. “Ghurar Al-Hikam Wa Durar Al-Kalim”, T. 9122.
4. S. al-Harrani “Tuhaf al-Uqul”, p. 172.
5. “Ghurar Al-Hikam Wa Durar Al-Kalim”, T. 8462.
6. M. B. Majlesi, “Bihar al-Anwar”, vol. 78, p. 321.    

The responsibilities of a Muslim towards family, relatives and other Muslims in general, were already reviewed in an article. Here one's responsibility in Islam towards neighbors, friends, and enemies are discussed.

The Responsibility in Islam Towards Neighbors 

Doing good to neighbors is highly emphasized in Islamic teachings: “Worship Allah and … be good to … the near neighbor and the distant neighbor” (4:36). Prophet Muhammad (PBUH&HP) advised Imam Ali (AS) to honor the neighbors, even if they are disbelievers (Kafir) [1]. Imam Ali (AS) said that Prophet Muhammad (PBUH) used to invite repeatedly to doing good to neighbors such that we thought he (PBUH) was going to consider an inheritance for them [2].

The rights of neighbors on one another as an important responsibility in Islam, are:

To honor them in their presence, and to help and care about them when they are absent [3]. It includes visiting neighbors when they are sick, to assist their funeral, and to offer them your tasty meals that smell good [4];
To keep their secrets. It means that not to look for their faults and errors. And, if ever you become aware of some of their faults, do not reveal them but try to conceal their deficiencies [3];
Do not leave neighbors alone in difficulties [3]; e.g., help them in case of financial needs [4];
Do not be jealous of them if God grants them some blessings [3];
Ignore their errors to yourself and forget about them. If ever they do wrong to you unintentionally, be patient and in peace with them [3];
Do not let others talk behind their back and reveal the deficiencies of your neighbors here and there [3].
Giving priority to the neighbors. It is narrated from Imam Hassan (AS) that Lady Fatima al-Zahra (AS) used to pray firstly for the neighbors and then for members of the family [5]. 

According to Imam Sadiq (AS), having good behavior and interaction with neighbors increases the provision (Rizq) [6]. Prophet Muhammad (PBUH) advised to respect neighbors as much as one should respect his\her mother [6] and he (PBUH) said: “God bless whoever does good to his\her neighbors” [7]. On the contrary, whoever sleeps peacefully at night while one of the his\her neighbors is hungry, God will deprive him of his blessings on the judgment day [8]. The same will happen to whoever annoys his\her neighbors [1]. 

Take your time and think about these attitudes towards the neighbors. Life will be surely much agreeable and peaceful if we improve our social interactions with our neighbors within the Islamic framework.

The Rights of Friends and Companions

Having a good companion is known as a blessing; on the contrary, a bad one is like a disaster [9]. Friends and companions have certain rights one over the other including:

To interact with them with generosity as much as you can, otherwise, be fair to them [3];
To be smiling when you meet them and to receive them modestly [3];
To respect them as they respect you [3];
To be the first one who does good to the other one, otherwise, try to compensate properly [3];
To help them in difficulties and whenever they are in need, as Imam Ali (AS) advised to [10];
To hold them in great affection according to Imam Ali (AS) [11];
Not to reveal their deficiencies and mistakes;
To encourage them in obedience to God and to prevent them from committing sins [3];
To be honest with them and not to cheat [3]; e.g., nor to talk behind their back neither to reveal their deficiencies and to guard their secrets;
To be trustworthy whenever they rely on you [3].

The Responsibility in Islam Towards the Enemies

The enemy here means a person whom one is in conflict with. There are some recommendations in Islamic resources on how to treat enemies and what is one's responsibility in Islam towards them:

To be fair with them [12]. According to Imam Sadiq (AS), a real believer (Mu'min) does not oppress his\her enemies [13];
To testify in favor of the enemies if they are right [14] even if your testimony is against yourself [3];
To keep the promises you made to your enemies [15];
To forgive and tolerate them, if possible [3]. According to Imam Ali (AS), there is a virtue in forgiving enemies [16];
To talk nicely and shortly with whoever you have complained of [3], to argue with them in a way that is best (16:125), and not to ignore their rights if ever you are wrong [3].

References:

1. M. Shoueiri “Jami’ al-Akhbar”, p. 84.
2. Shaykh al-Kulayni, “Al-Kafi”, vol. 7, p. 51.
3. Imam Zayn al-'Abidin (AS), “Treatise On Rights (Risalat al-Huquq)”.
4. responsibility towards others
5. Shaykh al-Saduq, "Ilal Al-Shara'i", p. 181
6. Shaykh al-Kulayni, “Al-Kafi”, vol. 2, p. 666.
7. Shaykh al-Saduq, “Al-Amali”, p. 288.
8. Shaykh al-Kulayni, “Al-Kafi”, vol. 2, p. 668.
9. “Ghurar al-Hikam wa Durar al-Kalim”, T. 4719-4720.
10. “Nahj al Balaqa”, p. 494.
11. “Ghurar al-Hikam wa Durar al-Kalim”, T. 9665.
12. Ibn Shu’bah, “Tuhaf al-Uqul”, p. 88.
13. Shaykh al-Kulayni, “Al-Kafi”, vol. 1, p. 47.
14. Shaykh al-Saduq, “Sifat al-Shia”, p. 24.
15. “Nahj al Balaqa”, p. 53.
16. “Ghurar al-Hikam wa Durar al-Kalim”, p. 435.