The Islamic community is divided into two main branches: Shiism and Sunniism. 

One of the significant differences between these groups lies in the concept of “Imamate”. Imamate is a religious doctrine embraced by Shiite Muslims, which asserts that after the holy Prophet (PBUH & HP), Allah almighty did not leave his servants without guidance. According to Shiite belief, the holy Prophet (PBUH & HP) designated successors who would guide the people, interpret the verses of the Quran and propagate the teachings of Islam. The number of these successors are 12 and they all are the descendants of the Messenger (PBUH & HP). The hadiths of the Prophet (PBUH & HP), accepted by all Muslims for their authenticity, confirm the existence of these successors.

Twelve successors 

According to a hadith narrated by Sunni recorders the Prophet (PBUH & HP) stated:

Indeed, this religion will not end until twelve successors [of me] rise among the people. 

The narrator says that after that, the Prophet said something that he didn’t hear so he asked his father what did the Messenger say and his father replied: “the Prophet said that they all are from Quraysh, the tribe of the Prophet. (1)

The holy Prophet (PBUH & HP) also said:

Indeed, I leave you two kinds of successor: one is the Book of Allah (The Quran) and the other one is my household. And indeed, they do not depart from each other until they meet me near the Kother pool [on the Judgement Day]. (2)

These reliable hadiths clearly show that the successors of the Prophet (PBUH & HP) are twelve men from his family.

The names of the twelve Imams on a tablet

There is a hadith narrated by the Shiite hadith recorders that mentions the names of all these successors. This hadith provides valuable insights into the Shiite Imams. 

Imam Sadiq (AS), the sixth Shiite Imam, narrates that his father, Imam Baqir (AS), once asked Jabir ibn Abdullah al-Ansari (one of the Prophet’s most important companions) to recount the story of the tablet he had seen in the hands of Lady Fatimah (AS), the beloved daughter of the Messenger, and tell him about the things that was written on that tablet. 

Jabir said “I swear to Allah, once during the Prophet’s lifetime, I visited the house of lady Fatimah (AS) to congratulate her on the birth of her son, Hussain (AS). Then I saw a green tablet on her hands, which I assumed to be made of emerald and it had white text resembling the light of the sun. So, I asked her what it was and she replied, ‘This is a tablet that Allah has bestowed upon my father, containing the names of my father, my husband, my sons and the successors of my father who are my descendants. The Messenger gave it to me to cheer me up.’” 

Jabir further added, “Your mother gave it to me, and I read it and copied it on another tablet.” Imam Baqir (AS) then asked “Can you show me your copy?” and Jabir replied “Yes.” 

The text was as follows:

In the name of Allah, the most Compassionate, the most Merciful.

This is a writing from Allah, the Almighty, the Wise, to Muhammad (PBUH & HP), His Prophet, His Light, His Messenger, His Mediator and the Guide to Him. The Trustable Spirit [Gabriel] has brought it from the Lord of the people. 

O Muhammad! Respect my names and be thankful of my gifts and do not deny my favors. Indeed I am Allah and there’s no deity but me. I am the annihilator of the oppressors and the helper of the oppressed and I am the Judge of the Judgement Day. So I punish the ones who desire the kindness of the others or dread the justice of others with a punishment I punish no one alike. Then worship only me and trust only on me. 

Indeed, I sent no Prophet whose time came to end except that I chose someone as their successor and I made you better than all the prophets and made your successor better than all the successors. And kindly gave you your two grandsons: Hassan (AS) and Hussain (AS). 

Then I chose Hassan as the repository of my knowledge after his father [Imam Ali (AS)] and I chose Hussain as the source of my revelations and made him a great one by giving him martyrdom and I made his destiny with salvation then he is the noblest martyr and the highest-ranked among all martyrs… 

Afterward, Allah almighty proceeds to mention all the successors of the Prophet (PBUH & HP) in this lengthy text as follows:

Ali (AS) the son of Imam Huassain (AS), also known as Sajjad, Muhammad al-Baqir, Jafar as-Sadiq, Musa al-Kazim, Ali ar-Ridha, Muhammad al-Javad, Ali al-Hadi, Hassan al-Askari. And the last of them is Imam Mahdi (AS), the savor of all Muslims. (3) He is still alive and will appear again in the future alongside Jesus, establishing justice on Earth full after it has been plagued by tyranny and oppression. (4)

All Shias believe that these twelve men are the successors of the Prophet and after the Prophet (PBUH & HP) they all came and taught people the teachings of Islam but the last of them is now alive and unknown by people. All Muslims, whether Shiite or Sunni, share the belief that Imam Mahdi (AS) will eventually emerge as the ruler of all the entire Earth, bringing justice to prevail. The Holy Quran says:

Certainly, We wrote in the Psalms, after the Torah: ‘Indeed My righteous servants shall inherit the earth.’ (21:105)

Resources 

1. Sahih al-Muslim, Muslim an-Neishaburi, vol.3, pg.1452
2. Musnad Ahamd, Ahmad ibn Hanbal, vol.35, pg.512
3.  Al-Kafi, Sheikh Koleini, vol.1, pg.528
4.  Al-Kafi, Sheikh Koleini, vol.1, pg.338
    

The concept of the last savior and his advent exist in many religions, although with some fundamental differences. Here we review what expecting the last savior in Islam means, what are its requirements and how it improves the quality of one’s life. 

1. Hoping for a Widespread Evolvement through the Last Savior in Islam

Awaiting, in general, represents a situation where someone is hoping or watching for something to happen, especially for a long time. Awaiting the last savior means hoping for the last divine messenger who will reveal the truth and spread justice and peace in the whole universe. In Surah Qasas, it is stated that: “We wanted to confer a favor upon those who were oppressed in the land and make them leaders and make them inheritors” (28:5). This is a promising divine concept which enlightens the hearts, prepares human beings for receiving who they are waiting for, and brings hope to them [1]. 

2. Not Standing the Current Circumstances

We are surely living in an era that is filled with injustice; some people are at war, and many of them face discrimination and hypocrisy. From an Islamic point of view, even the physical presence of the last savior brings mercy over human beings, and all these shortcomings are due to his absence. Hence, a conscious human being, a creature that is a perfectionist in nature, does not tolerate these shortcomings and defects and tries to remove the barriers against the presence of the last savior. 

3. Hoping for a Better World 

Being a perfectionist and trying to achieve a better condition is an inherent quality of the human beings that regulates almost all activities of every human being towards perfection. Hence, a conscious human being is naturally inclined toward accelerating the coming of the last savior.

4. Making Efforts to Pass the Current Unfavorable Condition and to Reach a Desirable Situation 

Hoping for a better future that the presence of the last savior will bring about is not sufficient. One should also make efforts and participate in the process of preparing the requirements of the advent of the savior.

5. Being Aware of the Absence of the Last Savior

Sometimes something is missed in our life, but we are not even aware of that. The very first step in the process of awaiting the last savior is to know that there is divine mercy that is absent.

6. Feeling the Need for the Advent of the Last Savior

One might be aware of the absence of the last savior but does not believe that human beings require his presence and guidance. Hence, waiting for the last savior requires one to contemplate and know what his presence will bring about for human society. In fact, this situation is like a divine test to see whether one will rely on his\her abilities and will to improve the current condition.

7. Believing in and Wishing for the Future Coming of the Last Savior

Those who do not believe in the advent of the last savior will undoubtedly not await for him. Prophet Muhammad (PBUH&HP) and Imams (AS) have always tried to reinforce the belief in the advent of the last savior and to prevent any despair among human beings. In this regard is a narration (hadith) from Prophet Muhammad (PBUH&HP), which describes that The Judgment Day will not arrive until one of his descendants rises with the truth and makes his advent whenever Allah permits [2]. One who believes in the advent of the savior in Islam should also wish that it happens, otherwise, he\she is not really awaiting his advent. This requires having a clear vision of the things that will happen if the last savior emerges. If one is afraid of that time, he\she will surely not await for him to come.

8. Believing that the Advent of the Savior Is Close

Although the items above make one await for the savior, believing that this might happen very soon will cause one to get ready to help the last savior in Islam in his peace plan.

References:

1. M. Musavi Isfahani,"Mikyal al Makarim", vol. 2, p. 235.
2. Wasa’il ash-Shi’a, vol. 7, p. 325.