Haj is performed because Allah has invited the believers to congregate together. Regardless of place of birth, nationality, ethnicity, gender, or status, all are welcome, and all are equal in the sight of Allah. The Muslims gather to meet one another and demonstrate to each other, and the world that they are united. They are united by their worship of One God.
''O humankind! We have created you from a male and a female, and made you into nations and tribes, that you may know one another. Verily, the most honorable of you with Allah is that (believer) who has At-Taqwa (piety, Allah consciousness). Verily, Allah is All-Knowing, All-Aware.'' (Surah Al-Hujurat, 13)
Islam is the religion of unity. Repeatedly throughout the Qur’an God reminds the believers that they must remain united and seek strength through unity. Haj epitomizes this unity. People from every race and color come together in submission to the will of God. Muslims are one brotherhood and they come together with a sense of purpose and a desire for peace.
''The believers are nothing else but brothers (in Islam). So make reconciliation between your brothers, and fear Allah, that you may receive mercy.'' (Surah Al-Hujurat,10)