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

The Holy Quran is said to be "the highest miracle of Islam". But why would a book turn out to be the proof of Prophet Muhammad’s (PBUH) prophethood? What does it reveal about Islam's attitude toward the issue of learning or seeking knowledge?  How does a true Muslim seek knowledge?

There are many verses in the Quran about acquiring knowledge. The very first verse of the Quran that was sent to our Prophet starts with an imperative form of the verb "read" (Ighra) [1]. Literacy and having knowledge is so important in Islam that Quran equals illiteracy to being in darkness [i]. Accordingly, it is the duty of any Muslim to try to learn. Besides, many Islamic scholars advise Muslims to strive for achieving knowledge. One of them is a quotation (hadith) from Prophet Muhammad (PBUH&HP): “Seek knowledge, even if it is in China”. Considering the distance between the Arabian Peninsula (where the Prophet lived) and China as well as the lack of transportation 14 centuries ago, one can imagine how arduous it was to travel there. In addition to many life-threatening dangers, it is no exaggeration to say that it took several months to arrive there. This shows the emphasis on the importance of learning.

When the prophetic mission of Prophet Muhammad (PBUH&HP) started, most people in his land were illiterate, so, he asked the literate ones to teach Muslims; even prisoners of war were granted freedom provided that they taught literacy to at least ten Muslims. It has been said that once, the Prophet (PBUH&HP) entered a mosque and saw two groups of people; one group was praying and the other was sharing knowledge. He stated that both of them were doing a good job, and then continued his speech by saying that he was sent to people by God “to teach” them. So he went and sat in the second group [2]. When Prophet Muhammad (PBUH&HP) was alive, there were places like schools where both women and men had the freedom to take part in classes. And, different fields of knowledge were learned including religion, literature, poetry, rhetoric, medicine, astronomy, etc [3].

A human being is curious by nature. We have been created with an inquiring mind. It has been said that all human beings are bestowed a gift, that is the brain as well as the desire for learning. The desire to learn is in our nature [4]. In Islamic instructions, there is a huge emphasis on the value of seeking knowledge. It has been quoted from Prophet Muhammad (PBUH&HP): “Seek knowledge from the cradle to the grave”. It is a must for every Muslim regardless of their age, race, or gender [5]. All people must have the ability and liberty to learn, teach, exchange, and share information. It does not matter from whom you are learning. As long as they have the knowledge, it would be perfect. There is an Islamic hadith from the fifth Imam of Muslims, Imam Muhammed Al-Bagher (AS), quoted from Jesus Christ (AS) saying that: “Learn knowledge from someone who has it and does not look at their deeds.” There is no kind of prejudice whatsoever in choosing the teacher. The only important thing is the learning itself. Besides, ignorance has been known as the root of many miseries; and knowledge is like a vast amount of treasure that never runs out.

Notes:
[i]. (13:16)

References:

1. Ahamiyate Danesh-Andoozi az Nazare Eslam Akhlagh va Irfan 
2. Morteza Motahari, "Talim va Tarbiyat Dar Eslam [Education in Islam]", Sadra, p. 22, 2008.
3. Soheyla Jalali, Derakhsheshe Zanane Mosalman Dar Arseye Elm va Farhang Dar Sadre Eslam Pajooheshgahe Oloom va Farhange Islami
4. Morteza Motahari, "Moghadame'I bar Jahanbiniye Eslami. [An Introduction to Islamic Ideology]", Sadra, p. 274, 2004.
5. Faeze Azimzade Ardebili, Hghe Amoozeshe Zanan Dar Eslam va Gharb [The Right of Learning for Women from Islamic and Western Viewpoint