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.

The one who converts to Islam or someone who has just decided to know more about Islam, you may have come across this dilemma as to which books are better to study and which would give you a fuller and more comprehensive view of Islamic matters.

In what follows we have suggested some of the most significant Islamic books which are essential for anyone who is interested in Islam or is looking for answers to his/her questions. The books in this list include basic pillars of Islam, the most important obligatory practices, as well as ethical, historical and philosophical matters related to the religion of Islam. 

1. The Holy Quran

The intellectual miracle of Prophet Muhammad (PBUH), the Quran is the holy book of Muslims which includes many historical, ethical, spiritual and social matters brought through a unique, cohesive and capturing language. This book offers anyone who is in search of the truth with revealing and thought-provoking information and is a must-read book for converts to Islam.

2. Nahjul Balagha by Imam Ali (AS)

Nahjul Balagha includes a series of sermons, letters, and sayings by Imam Ali (AS) and compiled by Allamah Sharif Razi which deal with many a wide variety of topics including our existence, our relationship with God, Islamic codes of ethics in all aspects of life whether personal or social. Reading this book helps you realize the deep moral concerns of Islam and the wisdom that lies behind this religion.

3. Islam: An Introduction by Annemarie Schimmel 

Written by an influential German scholar, Annemarie Schimmel provides us with unbiased, simple and introductory information about the religion of Islam. This book approaches Islam with a more historical attitude through which the pre-Islamic time, the emergence of Islam, the figure of Prophet Muhammad’s (PBUHHP) as the messenger of this religion and the process of Islam’s expansion are explained. It also includes some information about the Quran, the Islamic law, and tradition, the philosophy of Islam, different Islamic sects, mysticism, etc.  It can be a very helpful guide for converts to Islam.

4. How to Become A Muslim: 3 Things One Should Believe in before Embracing Islam by Salam Islam

This brief e-book provided by Salam Islam explains the three significant steps before the action of converting to Islam. These include the belief in one God (Monotheism), belief in the prophets (Prophethood) send by God and the belief in the afterlife (Ma’ad).

5. Islamic Teachings in Brief by Allamah Sayyid Muhammad Husayn Tabatabai

This book, written in a relatively simple language, presents a summary of the teachings of Islam to provide some information for those who are not able to examine Islamic matters deeply and in a specialized manner. The book starts with a general reflection on the concept of religion and belief, explains the pillars of Islam and finally gives an insight into the practical principles of Islam.

6. Understanding the Qur’an, Part 1 & 2 by Murtadha Mutahhari

This book is an attempt to bring a clearer understanding of the concepts that are mentioned in the Quran which is very helpful for converts to Islam. It starts with the ways the Quran can be understood, and it comprises of two main parts: Understanding the Quran analytically and Reason in the view of the Quran. Very thorough and interesting work.

7. Goal of Life by Murtadha Mutahhari

Have you ever wondered about your existence? Why have you been created? What is the purpose of your life? This book discusses the goal of life from the viewpoints of the Quran and various schools of thought. The topics discussed throughout this book include the goal of creation, the basis of individual and social ethics, faith, schools of thought and world vision, Islamic faith, and human perfection, and the summary of Islamic monotheism. 

8. The Heart of Islam: Enduring Values for Humanity by Seyyed Hossein Nasr

This book offers a timely presentation of the core spiritual and social values of Islam: peace, compassion, social justice, and respect for the other. Seizing this unique moment in history to reflect on the essence of his tradition, Seyyed Hossein Nasr seeks to "open a spiritual and intellectual space for mutual understanding." Exploring Islamic values in scripture, traditional sources, and history, he also shows their clear counterparts in the Jewish and Christian traditions, revealing the common ground of the Abrahamic faiths.

9. Philosophy of Religion by Muhammad Taqi Ja‘fari

Why do we need religion? What is the benefit of believing in a particular religion? This book written by one of the most significant Muslim scholars offers an in-depth discussion on the philosophy behind the concept of religion and how it shapes our lives toward perfection and happiness. 

10. What is Hajj (the holy pilgrimage) and Why Do We Perform It? By Salam Islam

The ritual of Hajj or the Islamic holy pilgrimage is one of the most important occasions in the Islamic calendar. During this period Muslims from all around the world gather in the holy city of Mecca to perform certain rituals. In this e-book, you will get familiar with the basic rituals that must be performed during Hajj and know more about the philosophy behind these rituals.

11. 6 Facts about Hijab and Modesty in Islam by Salam Islam

Hijab in Islam is a common term that represents a range of personal and social codes of behavior and addresses women specifically while requiring specific actions on the part of men as well. In this e-book Hijab and modesty in Islam will be explained through six facts that reveal different aspects and reasons regarding this concept.

12. 4 Facts about Muslims' Eating Habits by Salam Islam

What are the rules and regulations that Muslims should observe in their eating habits? This e-book provides the converts to Islam with a brief and straightforward guide to the kinds of foods and drinks Muslims are allowed to use and those that are forbidden to them. 

13. Adab as-Salat: The Disciplines of the Prayer by Sayyid Ruhollah Musawi Khomeini

Why do Muslims perform the prayer (Salat)? What are the spiritual and mental benefits of this action? What are the secrets that lie behind the disciplines of Salat? This book offers a great insight into one of the most important obligatory practices of Muslims, prayer (Salat), and help new Muslims and converts to Islam to have a better understanding of this action. 

14. Seeking the Straight Path: Reflections of a New Muslim by Diana Masooma Beatty

Written by one of the converts to Islam, this book illustrates common challenges and issues faced by converts, the reasoning behind the conversion, analysis from a Western view of many controversial or misunderstood topics in Islam, and basic information needed by new converts.

Please note that here we have attempted to name a few most significant books that can give you a better insight into the religion of Islam and help you in your path toward converting to Islam. However, there are many other helpful and great books that approach Islamic matters sophisticatedly many of which you can find in Salam Islam’ s library and other online Islamic libraries.