Once Imam Sajjad (AS), the fourth Shiite Imam, heard a beggar asking people for charity on the 9th day of Dhu al-Hajjah, the day of Arafah. Imam Sajjad (AS) was surprised and said: 

Shame on you! Are you asking somebody for help other than Allah on this holy day? While on this day, even the fetus in the uterus hopes that Allah might grant them a happy future in the world (1)

As Imam Sajjad (AS) said, the day of Arafah is the day of Allah’s great mercy toward humanity. There are two important occasions in the Islamic calendar that are considered as the most important ones: the day of Arafah and the night of Qadr.

The Arafat plain

On the second day of their pilgrimage, hajj pilgrims must stay in the Arafat plain from noon until sunset, praying and seeking forgiveness from Allah Almighty and thanking Him for the opportunity to perform Hajj. This is known as “Wuquf in Arafat”. The Arafat plain is a special place near Mecca, and it is said that no one has ever sinned in this plain. 

There is also a mountain named Arafah in this plain, also known as “Jabal ar-Rahmah” which means “the mountain of Mercy”. About this mountain, Imam Baqir (AS) said:

Anyone who stays on this mountain, Allah will grant them their wishes. For the good people, Allah will grant all their wishes whether they are about this world or the Hereafter but for the bad people, only their worldly wishes will be granted (2)

Prophet Muhammad (PBUH & HP) stood on this mountain in his last days and bid farewell to his followers. 

Praying in this day

The most important practice for all the pilgrims in Mecca and those who couldn’t make it there is praying. 

Ibrahim ibn Hashim, one of the Shiite scholars, once saw Abdullah ibn Jundab, one of the pupils of Imam Kazim (AS), in the Arafat plain. He said, “I saw no one like him in the plain; his hands were up in prayer all the time, shedding tears that dropped onto the earth. When people left, I told him ‘I didn’t see no one praying like you in this plain’. Abdullah ibn Jundab replied ‘I swear to Allah that I prayed only for my brothers (other Shiites) because Imam Kazim (AS) told me that anyone who prays on this day for their brothers will be called from the heavens, and Allah has given them thousand more things than what they wished for their brothers’”. (3)

Imam Ali (AS) said:

It is not obligatory for the people to gather in the Arafah Day, except if they are in Mecca, but it’s no problem if people gather in the other cities and call upon Allah together. (4)

Sudair as-Sirafy, one of the pupils of Imam Sadiq (AS), asked him about fasting in the Arafah day. Imam Sadiq (AS) said “My father wouldn’t fast on this day [and I won’t neither]”. Sudair asked: “why don’t you?” Imam Sadiq (AS) said:

The Day of Arafah is a day of supplicant and prayer. Therefore, I worry that fasting would make me weak and I couldn’t pray enough, so I don’t want to fast on this day. (5)

There are some famous prayers narrated from the Shiite Imams that should be recited on this day. Imam Hussain (AS), before he moved to Karbala, stayed in the Arafat Plain and prayed humbly with his hands raised, asking Allah for forgiveness and mercy. This beautiful prayer is full of teachings about Allah and its recitation is highly recommended. Shias mostly go to holy places like mosques and shrines and recite this prayer together. 

Imam Sajjad (AS) also has a prayer exclusively for this day, which is written in the book “Sahifah as-Sajjadiah”. 

Other recommended practices

Other than praying, there are some rituals mentioned in the hadiths that one can do on this day:
•    Those who can’t make it to Mecca can visit the shrine of Imam Hussain (AS) in Karbala. In this regard Imam Sadiq (AS) said,

Anyone who makes pilgrimage to Karbala and washes their body in the Forat (a famous river there), and then goes to the shrine of Imam Hussain (AS), for every step they take, Allah considers it like a pilgrimage of Hajj”. (6)

•    Giving charity to the needy ones
•    Performing ghusl (a ritual bath) 
•    Fasting. Imam Ridha (AS) said,

Fasting on the day of Arafah is equal to fasting for a year. (7)

However, as Imam Sadiq (AS) mentioned, if fasting weakens you and hinders your prayer, it’s better not to fast. 

Resources 

1.   Man la Yahduruhu al-Faqih, Sheikh Saduq, vol.2, pg.211
2.   Vasa’il ash-Shia, Sheikh Hurr al-Ameli, vol.13, pg.546
3.  Vasa’il ash-Shia, Sheikh Hurr al-Ameli, vol.13, pg.544
4.   Vasa’il ash-Shia, Sheikh Hurr al-Ameli, vol.13, pg.561
5.   I’lal ash-Shara’I, Sheikh Saduq, vol.2, pg.386
6.   Al-Kafi, Sheikh Koleini, vol.4, pg.580
7.   Al-Istibsar, Sheikh Toosi, vol.2, pg.133
    

Visiting the tomb of Imam Hussain (AS) has been popular among Shiites since the time of the Shia Imams who taught Shiites that this pilgrimage plays a significant role in a Shia’s life as quoted from regard Imam Sadiq (AS) in this regard:

Do not pull back from going to Karbala for visiting the shrine of Imam Hussain (AS) out of insecurity or fear because anyone who does, will regret it so much that he wished the grave of Imam Hussain (AS) was near to him. Don’t you like to be one of those for whom the Prophet (PBUH & HP) and Imam Ali (AS) and Lady Fatimah (AS) and the Imams pray? (1)

Having a significant impact on every aspect of our lives, the Shia Imams encouraged us to fulfill this pilgrimage. such a great event which has been discussed and studied through so many aspects for example its history, its political and social impacts and so forth; but seldom have its moral effects on our personality been examined. Arbaeen pilgrimage may change our individual and social life in so many ways from which we’re going to mention some in this text.

The Impact of Arbaeen 

To Purify our Souls 

To purify soul in Islamic culture means changing our personality in a way that we obtain so many virtues and redeem our souls from bad habits or sins. Experiencing a very spiritual and calm atmosphere during this journey, anyone can revolutionize their lives and repent from all of their sins. 
Imam Sadiq (AS) said:

Should anyone leave their house in order to visit the grave of Imam Hussain (AS) Allah blesses them with a reward for each step they take if they go on foot and forgives one of their sins. (2)

To Practice Patience and Endurance 

Imam Hussain (AS) himself is the emblem of patience and endurance as he sacrificed all he had for the sake of Allah even his own life but he didn’t surrender to the tyrant oppressors. He and Lady Zeinab (AS) showed us how much a human can be patient facing the intolerable hardship that happen in their life. Imam Hussain (AS) even chose his companions from the most tolerant ones so that they could accompany him on his journey. For that matter, once he said to his people:

Anyone who is able to resist the sharp edges of swords and the invective of tongues can come with us and anyone who doesn’t must leave us (3) 

Nowadays although Iraqi people have made it so much easier for the pilgrims, taking this trip to visit Imam Hussain’s holly shrine (AS) is still full of dangers and hardships . When the pilgrims undergo these difficulties and think about the patience that Imam Hussain (AS) and his companions had, they can practice how to be patient in their own life. 

Self-esteem

When a pilgrim puts their heart and soul into reach a certain destination which is the land of Karbala to pilgrimage Imam Hussain’’s shrine on their way they endure so many problems and difficulties, they understand what a human is verily capable of. They can find out that life isn’t just the material world that we see around us but humans  are able to see something more in this life and sacrifice all they have for it. It makes people value their souls, believe in themselves and raises their more self-esteem. 

The Impact of Arbaeen Pilgrimage on our Social Life

Infaq and Generosity  

In Islamic culture, “Infaq” means helping people by giving charity, spending your time for them or even teaching others for free and stuff like that . 

During Arbaeen rituals , money isn’t an important issue for the pilgrims as people’s needs are mostly provided by others in Iraq. Most of Iraqi people even save money for a year so that they can help the pilgrims during the Arbaeen rituals with food, medicine and so forth. 

This enthusiasm for Infaq roots in the Islamic teachings and the messages of the Quran where says:
The parable of those who spend their wealth in the way of Allah is that of a grain which grows seven ears, in every ear a hundred grains. Allah enhances severalfold whomever He wishes, and Allah is all-bounteous, all-knowing. (2:261)

Also about the importance of the Arbaeen walk Imam Sadiq (AS) says:

For each coin that they spend for the sake of Imam Hussain (AS) Allah will consider it ten thousand coins and rewards them as they have spent that much and Allah will be pleased with them and the Prophet (PBUH & HP) will pray for them and Imam Ali (AS) and the Imams will do so. (4)

Cooperation and Empathy

The holy Quran says:

Cooperate in piety and God-wariness, but do not cooperate in sin and aggression, and be wary of Allah. (5:2)

Arbaeen walk is a symbol for a society in which people with different ideas, nationalities, ethnicity colors, age groups, and religions work together to reach one common destination. The objective of all these people is the same and it’s making Allah pleased with themselves by commemorating the sacrifice of Imam Hussain (AS). People respect each other and help just for the sake of Allah.

Political Insights 

Pilgrims in this ceremony think more about the message of Imam Hussain (AS) which was justice and fighting against tyranny, violence, and doing sins. Imam Hussain (AS) himself says:
I didn’t start this movement so that I could achieve a status among people or to please my desires. I didn’t do it to create chaos or to oppress. I started this movement so that I could make the followers of my grandfather better people; I want to enjoin others to do good works and prevent them from doing sins and I do as my grandfather and my father did. (5)

This walk helps us change ourselves and the others and understand that sitting down and watching people being in pain and oppressed is not what Allah wants us to do. We all are responsible for the circumstances in our society.  
 
Resources 

1.   Kamil az-Ziarat, Ibn Qulavaih, Pg.127
2.    The same, Pg.143
3.    Yanabi’ al-Mavaddah, al-Qunduzi, vol.3, Pg.62
4.    Kamil az-Ziarat, Ibn Qulavaih, Pg.139
5.   Bihar al-Anvar, Allamah al-Majlesi, vol.44, Pg.329