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.

Muslims commemorate the fortieth day after the martyrdom of Imam Hussain (AS) and his companions, called Arbaeen, meaning the fortieth day in Arabic. They all gather around the city of Karbala and Imam Hussain’s (AS) shrine, mourning and lamenting the unfair and cruel war between his comrades and those of Yazid Ibn Muawiyah, which led into the death of those pure men and the bondage of their families. 

This commemoration happens every year around the city of Karbala. Muslims begin to walk to Karbala from other towns. They gather together in groups to pray, and especially to mourn the martyrdom of Imam Hussain (AS).
This walk is a hard one. It takes at least three days and lots of energy and time. So, why do Muslims take that? What is the philosophy behind it? 

To answer our questions, first, let’s have a review of the history behind this walk and then move to the other aspects of this commemoration. 

1. What is the Arbaeen Walk?

The history of Arbaeen walk goes back to the first visitors of Imam Hussain (AS) after his death. On the day of Arbaeen, forty days after the tragic martyrdom of Imam Hussain (AS), Imam’s (AS) son, sister and the remaining members of his family and that of the other martyrs came back to Karbala to lament the death of their dear ones besides their graves.  

Their next visitor was Jabir Ibn Abdullah Ansari on the year 61 AH. Visiting Imam Hussain’s (AS) shrine was a tradition in Shiite culture until a short period after Morteza Anasari’s became the religious reference (Marja’) of Shiite Muslims. It was then lessened for some years and then revived. Some other religious references (Marja’) kept this tradition alive among their followers, until the government of Saddam Hussain, which banned all religious Shiite traditions to be performed publically [1]. 

The tradition was revived after the fall of Saddam, and it is still to be continued. 

2. Why on Foot?

Visiting the holy shrines and going on pilgrimages on foot is not something new or belonging to our age. It’s got a long history, and Adam did the first pilgrimage on his visit to Mecca [2]. It isn’t a tradition just among Muslims either. It is performed in other faiths and religions, too. For instance, Caesar made a vow to his God to go on a pilgrimage to the Dome of Rocks if he won the battle against the Empire of Persepolis (Iran). He performed his vow after his victory [3].

Pilgrimages are highly admired, and their act is seen as a way of getting closer to Allah by Imam Sadiq (AS). Visiting the holy shrines of the twelve Imams (AS) is even more praised, especially the sacred shrine of Imam Hussain (AS). Of course, it’s not these shrines themselves that are of value and importance, but the people who have been buried there. Thus, when one makes a pilgrimage toward these shrines, he/she finds the chance to think more about these great personalities who won Allah’s satisfaction and praise and were Muslims in the real sense of the word. So, in every step that a pilgrimage takes toward Imams' (AS) shrines, especially that of Imam Hussain (AS), he/she is getting closer to a source of spiritual blessing, bringing him/her thousands of virtues and wiping away thousands of vices from his/her mind and soul.

3. What is the Philosophy behind the Arbaeen Walk?

The Arbaeen pilgrimage is not merely a long walk. Instead, it is a kind of movement in which despite being in publics, pilgrims have their own private relationship with Allah and Imam Hussain (AS), which finds a new form of divine immaterial dependence and conformance. Thinking about the goals and the history behind the martyrdom of Imam Hussain (AS), the injustice and cruelty imposed on his family and the devotions of his faithful followers brings about many personal and social growth and improvements. 

Meeting other Muslims, exchanging ideas, and making friendships with Muslims of the other countries is another social outcome of this pilgrimage. One finds out that they are not alone in their faith, and have friends all over the world. They may have differences, but they have one thing in common: Belief in Imam Hussain (AS) and his right cause. 

The last and the most crucial point to mention this great gathering is it's a kind of preparation for the grand reappearance of Imam Mahdi (AS), the awaited savior among Muslims. The Arbaeen pilgrimage is to make the minds and souls ready for this great event. It is said that when Imam Mahdi (AS) reappears, he introduces himself as the son of Hussain (AS) [6], whose fame has reached many people through the Arbaeen Pilgrimage; one of the most significant religious gathering around the world, with the estimated number of 40,000,000 people participating in it, whose news is broadcasted all over the world [5].  

References

1. "The background of Arba'een rally/The importance of Najaf-Karbala rally from the scholar's viewpoint." Fars News. Archived from the original on 16 November 2015. Retrieved 4 October 2015.
2. Hor Ameli, Muhammad Bin Hussain Vasayel-o-Shia, Vol 11, p 132
3. Sobhani, Jafar The Light of Eternity p. 696
4. Kamel-o-Ziyarat: Pp 183, 184 and 185
5. Philipson, Alice (19 January 2015). "The ten largest gatherings in human history." The Telegraph. Archived from the original on 6 October 2015. Retrieved 3 October 2015. 
6. Khademi Shirazi, Mohammad Yad’e Mahdi P16, P132