More than two million Muslims gathered from around the globe in the holy city of Mecca in Saudi Arabia have begun this year’s Hajj pilgrimage.

Iran Press/Middle East: According to news media, about 2.5 million Muslim believers are participating in this year’s Hajj pilgrimage, which started on Friday.

The nearly month-long pilgrimage features various rites, including stoning a column representing the devil, sacrificing sheep in remembrance of Prophet Abraham’s offered sacrifice, and Tawaf, which consists of walking and praying around the Kaaba, Islam's holiest shrine, at the Grand Mosque in Mecca.

The gathering is also seen as a symbol of Muslim unity, with all participants required to wear a simple and identical outfit during the processions.

The clothing consists of a two-piece white seamless garment for men, and a loose cover-all dress for women.

Muslim scholars have pointed that the simple attire, along with other aspects of the pilgrimage, are meant to express unity and the humility of the Muslim Ummah — the Muslim people as a whole —  towards God.

The pilgrimage ends with the start of Eid al-Adha, also known as the "Festival of Sacrifice".

Each and every able-bodied Muslim, male or female, is required to complete the religious trip at least once in their lifetime if they also have the sufficient financial capacity to do so.

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Millions of Muslims have begiun annual Hajj pilgrimage
Millions of Muslims have begiun annual Hajj pilgrimage