Over two million Muslim pilgrims began moving to the valley of Mount Arafat for a day of prayer, marking the peak of the annual Hajj.
Please, scroll down to see photos of the largest annual gathering of people in the world!Faithful of all ages from around the world camped at the foot of Mount Arafat, where they slept and prayed at the spot where Prophet Mohammed is believed to have given one of his last famous sermons about 14 centuries ago calling for equality and unity among Muslims.
READ ALSO: Pope Francis Arrives In America For The First Time Ever
The hajj began Tuesday with pilgrims circling the Kaaba, a cuboid building also known as the "House of God" at the center of Islam's most sacred mosque, Al-Masjid al-Haram, in Mecca, Saudi Arabia. From there they visit Mina before proceeding on to Mount Arafat.
READ ALSO: Sultan Directs To Pray For Nigeria’s Unity, Peace
Hajj is a mandatory religious duty for Muslims that must be carried out at least once in their lifetime by all adult Muslims who are physically and financially capable of undertaking the journey, and can support their family during their absence. For many believers, pilgrimage is the spiritual highlight of their spiritual lives.