The Hajj is the annual pilgrimage to Mecca, Saudi Arabia. It is currently the largest annual pilgrimage in the world, and is the fifth pillar of Islam, a religious duty that must be carried out at least once in their lifetime by every able-bodied Muslim who can afford to do so. The Hajj is a demonstration of the solidarity of the Muslim people, and their submission to God (Allah in the Arabic language). – Wikipedia

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