The word Kaaba means cube in Arabic, and it refers to the square-like building in the holy city of Mecca, which is covered with a silk and cotton veil. It is the most sacred site for Muslims, and millions of people travel to visit that as a pilgrim each year. 

Many people think that Kaaba was built at the time of Prophet Muhammad (PBUH&HP) and with the advent of Islam. However, history has a different narration about which we are going to talk in this article. 

1. The First People who Built Kaaba

The first person who built Kaaba was Adam (PBUH), and it was remained unharmed until the great flood at the time of Noah (PBUH) [1], which caused it to be partially damaged. Afterward, the structure of the Kaaba was reconstructed by prophet Abraham (PBUH) and his son, Ishmael, under the command of Allah. The Quran has narrated this story in this verse: 

As Abraham raised the foundations of the House with Ishmael, [they prayed]: 'Our Lord, accept it from us! Indeed, You are the All-hearing, the All-knowing. (2: 127)

2. Kaaba Between Abraham (PBUH) and Prophet Muhammad (PBUH&HP) 

The son of prophet Abraham (PBUH), Ishmael (PBUH), and a tribe named Jorohom were the guardians of Kaaba after the demise of prophet Abraham (PBUH). This magnificent building stood upright until that Jarhim tribe, and then a tribe named Amaaleh rebuilt the square-shaped holy place [2]. Years after, one of the predecessors of Prophet Muhammad (PBUH&HP) named Qusai Bin Kelab, made a wooden structure to protect the building and neighbored it with another building Called Dar-ol Nadvah, which was the governor's state. Then he asked each Quraysh tribe to locate their houses mirroring one side of the Kaaba, to build a circle around it. Some say that Kaaba was once ruined in flood before the time of Prophet Muhammad (PBUH&HP), but that again is not proven [3].

3. Kaaba and Prophet Muhammad (PBUH&HP)

When Prophet Muhammad (PBUH&HP) was chosen as the Messenger of Allah, Kaaba was considered a holy place. Some reference books say that Prophet Muhammad (PBUH&HP) took part in the reconstruction of the Kaaba after the flood. Also, there was a fight between the Arab clans about where to locate the Black Stone, and Prophet Muhammad (PBUH&HP) was chosen as the trustee of all clans to locate the holy stone on the eastern side's edge. (4) Kaaba was filled with idols and statues when Prophet Muhammad (PBUH&HP) left Mecca because of the severe tortures and problems the Arab clans made for him and his followers. Even years before, Kaaba was a place to worship the idols.
When Prophet Muhammad (PBUH&HP) gathered his followers and returned to Mecca, he ruined all those idols with the help of his first follower and friend, Imam Ali Ibn Abi Talib (AS). Kaaba became a center of performing Hajj and the Qibla [i] of the Muslims. The Dome of Rocks (Qubbat al-Ṣakhrah ) was the first Qibla of Muslims, but Allah inspired Prophet Muhammad (PBUH&HP)  to change it toward the Cubic Kaaba. 

4. Kaaba After Prophet Muhammad (PBUH&HP)

Kaaba has been reconstructed many times after the demise of Prophet Muhammad (PBUH&HP), but the cubic shape of the building has never been changed. Now, the Saudi Arabian Government is responsible for preserving this sanctuary, though it belongs to all Muslims and all nations. There are many different parts and holy sites around Kaaba, like the Black Stone, the Iraqi corner, the Kiswa, or the black covering, which we are going to discuss in our next articles.

Notes:

[i] Qibla is the direction to which all Muslims say their prayers.

References:

1. Arzaghi, Abu Valid Kaaba News and What happened to that, Vol. 1, P 68.
2. Seyyed Hashem Bahrani,Tafsir Al-Burhan Vol. 1 P 301 Hadith 36.
3. Rasouli Mahallati, Hashim Analytical History of Islam (2), (1991) Tehran, Iran. 
4. Guillaume, A. (1955). The Life of Muhammad. Oxford: Oxford University Press. pp. 84–87.
    

Unity between Muslims is considered as a crucial matter in Islam. Thus, the Quran compares discordance and disunity among Muslims to “a pit of the Fire”: "And hold firmly to the rope of Allah all together and do not become divided...And you were on the edge of a pit of the Fire, and He saved you from it." (3:103). Looking at the former nations, we find them honored and glorious when they were united, but disgraced and vulnerable when they fell apart [3]. Hajj, as one of the obligatory rituals in Islam, is one of the ways which encourages unity among Muslim nations. Let’s see how.

 Every Muslim is Welcomed to Hajj, No Exception!

There is no other ritual, social, or political program in Islam greater than Hajj, where every Muslim from any corner of the world finds the chance to approach others and communicate with them freely. 
Besides, it provides the opportunity to strengthen the emotional, social, and religious bonds with other Muslims. Hajj is a social kind of worship that represents the glorious Islamic unity through its numerous participants of various nationalities, skin colors, languages, and sects who are like brothers (49:10). They have left behind the religious conflicts, and follow the same intention, perform the same actions, and wear the same outfit.   

Hajj Brings Muslims Power

In Surah Ma’idah, it is stated that coming together around Ka’aba makes Muslims powerful (5:97). In other words, the aim of Hajj for Muslims is not just performing some physical actions. It is to bring Muslims of different races and origins together to get acquainted, communicate with each other, initiate political, economic and cultural relations, and find themselves closer to each other despite their many differences. 

Besides, Islam calls “every” Muslim to Hajj, which means that everyone, regardless of origin and skin color, is invited to the land of Allah. It reminds us of what the Quran says; that there is no superiority except rightfulness and the most righteous, is the noblest in the sight of Allah (49:13). This is an important message, especially for the less powerful Islamic nations, causing them to feel more confident and encouraging them to communicate with other Muslims, which ultimately results in a more united Muslim society. 

Muslims Are Like the Hands which Help Each other

In a discourse that Prophet Muhammad (PBUH&HP) has given during one of his Hajj pilgrimages, he described Muslims as brothers, and like a single hand (a united community) when facing the enemies [2]. Emphasizing brotherhood among Muslims during Hajj shows that this ritual was a good representation of unity. Thus, Muslims are expected to support each other and be close to each other as they are during Hajj.

Two Axes of Solidarity in Hajj

During Hajj, Muslims learn and practice solidarity in two main areas:

1. Ideology and Principles

During Hajj, Muslims can exchange ideas with Muslims of other sects. In the early years of Islam when non-Muslims also went to Mecca for their religious rituals, Prophet Muhammad (PBUH&HP) took this opportunity to introduce Islam to them and exchange ideas with them to spread his message and find followers in other cities, too. In Hajj, many misunderstandings and ideological conflicts can be discussed among Muslims, and the real beliefs of different sects about the others can be clarified. Hence, the wrong prejudgments and hostilities can be rectified. According to Imam Sadiq (AS), Hajj is a means to gather all Muslims from east to west to let them get acquainted with each other and achieve consensus [3]. 

2. Social and Political Matters

Through the communications that Muslims have during Hajj, they find out the social achievements and national advances in other Muslim nations and might decide to follow their path. They also learn about the social problems and deficiencies of others and might find solutions by further cooperation. Moreover, they become aware of the real political situations of other Muslim countries, especially the difficulties that sometimes other countries impose on them. For instance, one of the goals of Hajj is to announce the support of Muslims for Palestinians and those oppressed in the world. This helps Muslims to become more united against common enemies of Islam.

To summarize, Hajj is a time that a Muslim finds him/herself in the accompaniment of millions of others who wear as simple as him/her and who repeat the same words as him/her as they move around Ka’aba. This is where “one” is transformed into the totality of ‘people’, establishing the universality of the Islamic community with the goal of approaching Allah. 

1. References:
2. Imam Ali (AS), Nahj-ul Balaqa, Infallible 192
3. M. B. Majlesi, "Bihar al-Anwar", vol. 21, p. 105. 
4. Shaikh al-Hur al-Aamili, “Wasa’il al-Shi’a”, vol. 11, p. 14