DUBAI, United Arab Emirates (AP) — Pilgrims, donning face masks and moving in small groups after days in isolation, began arriving to Islam’s holiest site in Mecca on Wednesday for the start of a historically unique and scaled-down hajj experience reshaped by the coronavirus pandemic.

The hajj is one of Islam's most important and profound requirements, performed once in a lifetime. It follows a route the Prophet Muhammad walked nearly 1,400 years ago and is believed to ultimately trace the footsteps of the prophets Ibrahim and Ismail, or Abraham and Ishmael as they are named in the Bible.

The hajj, both physically and spiritually demanding, is intended to bring about greater humility and unity among Muslims.

But rather than standing and praying shoulder-to-shoulder in a sea of people from different walks of life, pilgrims this year are social distancing — standing apart and moving in small groups of 20 to limit exposure and the potential transmission of the coronavirus.

The pilgrimage is a journey that Muslims traditionally experience with relatives. In past years, it was common to see men pushing their elderly parents around on wheelchairs in order to help them complete the hajj, and parents carrying children on their backs. The communal feeling of more than 2.5 million people from around the world — Shiite, Sunni and other Muslim sects — praying together, eating together and repenting together has long been part of what makes hajj both a challenging and rewarding experience like none other.

This year, however, pilgrims are eating prepackaged meals alone in their hotel rooms and praying at a distance from one another.

While the experience will be starkly different, it remains an opportunity for pilgrims to wipe clean past sins, deepen their faith and fullfil one of Islam’s five pillars.

For the first time in nearly a century, the Saudi government barred Muslims from entering the kingdom from abroad to perform the hajj in order to limit exposure of the coronavirus.

Instead, as little as 1,000 people already residing in Saudi Arabia were selected to take part in the hajj this year. Two-thirds are foreign residents from among the 160 different nationalities that would have normally been represented at the hajj. One-third are Saudi security personnel and medical staff.

The pilgrims had to be between the ages of 20 and 50 with no terminal illnesses and showing no symptoms of the virus.

All the pilgrims were tested for the coronavirus, given wristbands that monitor their movement and were required to quarantine at home and in their hotel rooms in Mecca ahead of Wednesday's start of the hajj. They will also be required to quarantine for a week after the hajj concludes.

International media were not permitted to cover the hajj from Mecca this year. Instead, Saudi government broadcast live footage from the Grand Mosque on Wednesday showing limited numbers of pilgrims, moving several feet apart, circling the cube-shaped Kaaba in the first rituals of the hajj.

The Kaaba represents the metaphorical house of God and the oneness of God in Islam. Observant Muslims around the world face toward the Kaaba during their five daily prayers.

During the hajj, Muslims circle the Kaaba counter-clockwise seven times while reciting supplications to God, then walk between two hills where Ibrahim's wife, Hagar, is believed to have run as she searched for water for her dying son before God brought forth a well that runs to this day.

This year, pilgrims will only be able to drink the water from this Zamzam well in packaged in plastic bottles. Pebbles for casting away evil that are usually picked up by pilgrims along hajj routes will be sterilized and bagged ahead of time. Pilgrims have also been given their own prayer rugs and special attire to wear during the hajj laced with silver nano technology that Saudi authorities say helps kill bacteria and makes clothes water resistant.

During the hajj, women forgo makeup and perfume and wear loose-fitting clothing and a head covering. Men dress in seamless, white terrycloth garments meant to emphasize the equality of all Muslims and prevent wealthier pilgrims from differentiating themselves with more elaborate garments.