Friday marks the beginning of an important three-day holiday for Muslims across the world with millions across the world joining together to pray, worship and celebrate.

Eid al-Adha, translating to the 'festival of sacrifice', commemorates the willingness of Ibrahim to sacrifice his son Ismail to Allah - a similar tale to that of Abraham and his son Isaac, found in the Torah and the Bible.

It has been reported that close to three million Muslims will mark the occasion with a pilgrimage to Mecca, called the Hajj, while millions more across the world celebrate with prayers, feasting, and visiting with family and friends.

There are also ritual slaughters of sheep, symbolising the ram Allah allowed Ibrahim to kill rather than his own son.

mecca hajj eid

Thousands of Muslims on the Hajj in Mecca

The congregation of three million in Mecca will be the largest single gathering of people across the world this year.

Elsewhere, in war-torn Syria, a four-day ceasefire has come into effect to allow Muslims to observe the holiday in peace.

However, in Afghanistan, as President Hamis Karzai calls for peace, at least 40 have been killed by a suicide bomb in the north of the country.

You can see some incredible pictures of Eid al-Adha across the world below

WARNING: Contains graphic images of animal slaughter

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  • SAUDI-RELIGION-HAJJ

    Thousands of Muslim pilgrims arrive to throw pebbles at pillars during the 'Jamarat' ritual, the stoning of Satan, in Mina near the holy city of Mecca, on October 26, 2012. Pilgrims pelt pillars symbolising the devil with pebbles to show their defiance on the third day of the hajj as Muslims worldwide mark the Eid al-Adha or the Feast of the Sacrifice, marking the end of the hajj pilgrimage to Mecca and commemorating Abraham's willingness to sacrifice his son Ismail on God's command in the holy city of Mecca, . Over three million Muslims from around the world are expected to perform the upcoming Hajj or pilgrimage. AFP PHOTO/FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

  • Muslim pilgrims pray on a rocky hill called the Mountain of Mercy on the Plain of Arafat near the holy city of Mecca, Saudi Arabia, Thursday, Oct. 25, 2012. Saudi authorities say around 3.4 million pilgrims — some 1.7 million of them from abroad — have arrived in the holy cities of Mecca and Medina for this year's pilgrimage. (AP Photo/Hassan Ammar)

  • Muslim pilgrims arrive to the Mountain of Mercy on the Plain of Arafat near the holy city of Mecca, Saudi Arabia, Thursday, Oct. 25, 2012. Saudi authorities say around 3.4 million pilgrims — some 1.7 million of them from abroad — have arrived in the holy cities of Mecca and Medina for this year's pilgrimage. (AP Photo/Hassan Ammar)

  • Muslim pilgrims pray outside Namira mosque in Arafat near the holy city of Mecca, Saudi Arabia, Thursday, Oct. 25, 2012. Saudi authorities say around 3.4 million pilgrims — some 1.7 million of them from abroad — have arrived in the holy cities of Mecca and Medina for this year's pilgrimage. (AP Photo/Hassan Ammar)

  • Muslim pilgrims pray outside Namira mosque in Arafat near the holy city of Mecca, Saudi Arabia, Thursday, Oct. 25, 2012. Saudi authorities say around 3.4 million pilgrims — some 1.7 million of them from abroad — have arrived in the holy cities of Mecca and Medina for this year's pilgrimage. (AP Photo/Hassan Ammar)

  • Muslim Eid al-Adha Celebration

    Indonesian Muslim women pray at a field during the Eid al-Adha celebration, Friday morning, Oct. 26, 2012 in Denpasar, Bali, Indonesia. Eid al-Adha, the celebration of sacrifice, is the second most important festival in the Muslim calendar, marking the end of the Hajj, the annual pilgrimage to Mecca. (AP Photo/Firdia Lisnawati)

  • A large tent encampment covers the Plain of Arafat near Mecca, Saudi Arabia Thursday Oct 25 2012 as millions of faithful converge for the annual Hajj, the most important pilgrimage of the Islamic faith. Thursday is Arafat Day, the second day of the Hajj pilgrimage on which it is said that the religion had been perfected and the following day is the first day of the major Islamic Holiday of Eid ul-Adha. (AP Photo/ Saudi Press Agency)

  • Crowds bow in prayer outside the mosque of the Plain of Arafat near Mecca, Saudi Arabia Thursday Oct 25 2012 as millions of faithful converge for the annual Hajj, the most important pilgrimage of the Islamic faith. Thursday is Arafat Day, the second day of the Hajj pilgrimage on which it is said that the religion had been perfected and the following day is the first day of the major Islamic Holiday of Eid ul-Adha. (AP Photo/ Saudi Press Agency)

  • SAUDI-RELIGION-HAJJ

    Thousands of Muslim pilgrims arrive to throw pebbles at pillars during the 'Jamarat' ritual, the stoning of Satan, in Mina near the holy city of Mecca, on October 26, 2012. Pilgrims pelt pillars symbolising the devil with pebbles to show their defiance on the third day of the hajj as Muslims worldwide mark the Eid al-Adha or the Feast of the Sacrifice, marking the end of the hajj pilgrimage to Mecca and commemorating Abraham's willingness to sacrifice his son Ismail on God's command in the holy city of Mecca, . Over three million Muslims from around the world are expected to perform the upcoming Hajj or pilgrimage. AFP PHOTO/FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

  • SAUDI-RELIGION-HAJJ

    Thousands of Muslim pilgrims arrive to throw pebbles at pillars during the 'Jamarat' ritual, the stoning of Satan, in Mina near the holy city of Mecca, on October 26, 2012. Pilgrims pelt pillars symbolising the devil with pebbles to show their defiance on the third day of the hajj as Muslims worldwide mark the Eid al-Adha or the Feast of the Sacrifice, marking the end of the hajj pilgrimage to Mecca and commemorating Abraham's willingness to sacrifice his son Ismail on God's command in the holy city of Mecca, . Over three million Muslims from around the world are expected to perform the upcoming Hajj or pilgrimage. AFP PHOTO/FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

  • SAUDI-RELIGION-HAJJ

    Muslim pilgrims throw pebbles at pillars during the 'Jamarat' ritual, the stoning of Satan, in Mina near the holy city of Mecca, on October 26, 2012. Pilgrims pelt pillars symbolising the devil with pebbles to show their defiance on the third day of the hajj as Muslims worldwide mark the Eid al-Adha or the Feast of the Sacrifice, marking the end of the hajj pilgrimage to Mecca and commemorating Abraham's willingness to sacrifice his son Ismail on God's command in the holy city of Mecca. AFP PHOTO/FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

  • SAUDI-RELIGION-HAJJ

    Muslim pilgrims arrive to throw pebbles at pillars during the 'Jamarat' ritual, the stoning of Satan, in Mina near the holy city of Mecca, on October 26, 2012. Pilgrims pelt pillars symbolising the devil with pebbles to show their defiance on the third day of the hajj as Muslims worldwide mark the Eid al-Adha or the Feast of the Sacrifice, marking the end of the hajj pilgrimage to Mecca and commemorating Abraham's willingness to sacrifice his son Ismail on God's command in the holy city of Mecca, . Over three million Muslims from around the world are expected to perform the upcoming Hajj or pilgrimage. AFP PHOTO/FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

  • Indonesian Muslims perform Eid al-Adha prayer on a street in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Dita Alangkara)

  • Indonesian Muslims perform Eid al-Adha prayer on a street in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/(AP Photo/Dita Alangkara)

  • Indonesian Muslims perform Eid al-Adha prayer on a street in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Dita Alangkara)

  • PAKISTAN-RELIGION-ISLAM-EID-CELEBRATION

    Pakistani Muslims travel on vehicles as they cross a bridge on the last day of the religious festival of Eid al-Fitr in Lahore on August 22, 2012. People traditionally visit the homes of their relatives and friends, and enjoy outdoor entertainment to to celebrate the Eid festival which marks the end of the month of Ramadan. AFP PHOTO / ARIF ALI (Photo credit should read Arif Ali/AFP/GettyImages)

  • PAKISTAN-RELIGION-ISLAM-EID-CELEBRATION

    Pakistani Muslims travel on vehicles as they cross a bridge on the last day of the religious festival of Eid al-Fitr in Lahore on August 22, 2012. People traditionally visit the homes of their relatives and friends, and enjoy outdoor entertainment to to celebrate the Eid festival which marks the end of the month of Ramadan. AFP PHOTO / ARIF ALI (Photo credit should read Arif Ali/AFP/GettyImages)

  • ISRAEL-PALESTINIAN-EID

    Palestinians from the West Bank enjoy the beach in the Mediterranean city of Tel Aviv on August 21, 2012 on the last day of Eid-al-Fitr festival, which marks the end of the Muslim holy fasting month of Ramadan . Tens of thousands of Palestinians visit Tel Aviv and other places in Israel after Israel granted travel permits to West Bank Palestinians for the first time since the year 2000 .AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/GettyImages)

  • PAKISTAN-RELIGION-ISLAM-EID-CELEBRATION

    Pakistani Muslims enjoy a ride at a fairground to celebrate the last day of the religious festival of Eid al-Fitr in Karachi on August 22, 2012. People traditionally visit the homes of their relatives and friends, and enjoy outdoor entertainment to to celebrate the Eid festival which marks the end of the month of Ramadan. AFP PHOTO / RIZWAN TABASSUM (Photo credit should read RIZWAN TABASSUM/AFP/Getty Images)

  • Indian livestock seller Muhammad Ali, 12, smokes a cigarette as he waits for customers ahead of the Muslim festival of Eid al-Adha in New Delhi, India on Thursday, Oct. 25, 2012. Muslims celebrate Eid al-Adha by slaughtering sheep, goats, camels or cows. The slaughter commemorates the biblical story of Prophet Abraham, who was on the verge of sacrificing his son to obey God's command when God interceded by substituting a ram in the child's place. (AP Photo/Altaf Qadri)

  • Filipino Muslims walk back to their homes after attending a prayer at the Blue Mosque in Taguig city, east of Manila, Philippines to commemorate an Islamic festival known as Eid al-Adha Friday Oct. 26, 2012. Muslims all over the world commemorate the Eid al-Adha or the willingness of Abraham to sacrifice his son Ishmael by slaughtering goats and cows as a form of sacrifice and distribute the meat mostly to the poor. (AP Photo/Bullit Marquez)

  • Muslim Eid al-Adha Celebration

    Indonesian Muslim women pray at a field during the Eid al-Adha celebration, Friday morning, Oct. 26, 2012 in Denpasar, Bali, Indonesia. Eid al-Adha, the celebration of sacrifice, is the second most important festival in the Muslim calendar, marking the end of the Hajj, the annual pilgrimage to Mecca. (AP Photo/Firdia Lisnawati)

  • Muslim women attend Eid al-Adha prayer in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Dita Alangkara)

  • Muslim sits near ATM booths as they attend Eid al-Adha prayer in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Dita Alangkara)

  • Indonesian Muslims perform Eid al-Adha prayer on a street in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/(AP Photo/Dita Alangkara)

  • Muslim Eid al-Adha Celebration

    Indonesian Muslim women pray at a field during the Eid al-Adha celebration, Friday morning, Oct. 26, 2012 in Denpasar, Bali, Indonesia. Eid al-Adha, the celebration of sacrifice, is the second most important festival in the Muslim calendar, marking the end of the Hajj, the annual pilgrimage to Mecca. (AP Photo/Firdia Lisnawati)

  • Indonesian Muslims perform Eid al-Adha prayer on a street in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Achmad Ibrahim)

  • Afghans prepare themselves to offer the Eid al Adha's prayers outside of Shah-e-Dushamshera mosque in Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al Adha is a religious festival celebrated by Muslims worldwide. (AP Photo/Musadeq Sadeq)

  • Afghans listen to preacher while offering the Eid al Adha's prayers outside of Shah-e-Dushamshera mosque in Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al Adha is a religious festival celebrated by Muslims worldwide. (AP Photo/Musadeq Sadeq)

  • Muslim sit on a street as they attend Eid al-Adha prayer in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Achmad Ibrahim)

  • Indonesian Muslims perform Eid al-Adha prayer on a street in Jakarta, Indonesia, Friday, Oct. 26, 2012. Muslims will later slaughter cattle and goats, with the beef and meat distributed to the needy in the holiday which honors the prophet Abraham for preparing to sacrifice his son Ishmael on the order of God, who was testing his faith. (AP Photo/Dita Alangkara)

  • An Afghan woman walks past by men after offering the Eid al Adha's prayers outside Shah-e-Dushamshera mosque in Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al Adha is a religious festival celebrated by Muslims worldwide. (AP Photo/Musadeq Sadeq)

  • Iranian worshippers perform their Eid al-Adha prayers at Tehran University campus in Tehran, Iran, Friday, Oct. 26, 2012. Muslims around the world celebrate Eid al-Adha, or the Feast of the Sacrifice, one of biggest Muslim holidays, to commemorate the prophet Abraham's faith in being willing to sacrifice his son. (AP Photo/Vahid Salemi)

  • Kenyan Muslims hear sermon by an imam at Noor Mosque in Nairobi, Kenya, Friday, Oct. 26, 2012 during Eid al-Adha, or feast of sacrifice. Eid al-Adha is an important religious holiday celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Sayyid Azim)

  • A Kenyan Muslim offers prayers at Noor Mosque in Nairobi, Kenya, Friday, Oct. 26, 2012 during Eid al-Adha, or feast of sacrifice. Eid al-Adha is an important religious holiday celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Sayyid Azim)

  • Kenyan Muslim offers prayers at Noor Mosque in Nairobi, Kenya, Friday, Oct. 26, 2012 during Eid al-Adha, or feast of sacrifice. Eid al-Adha is an important religious holiday celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Sayyid Azim)

  • Afghans offer Eid al-Adha prayers outside a mosque in the outskirt of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • Afghans offer Eid al-Adha prayers outside a mosque in the outskirt of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • Afghans offer Eid al-Adha prayers outside a mosque in the outskirt of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • Thousands of Russian Muslims walk under their umbrellas after Eid al-Adha prayers that mark the end of the holy fasting month of Ramadan outside the main mosque in Moscow, Russia, Friday, Oct. 26, 2012. (AP Photo/Mikhail Metzel)

  • Thousands of Russian Muslims perform Eid al-Adha prayers that mark the end of the holy fasting month of Ramadan outside the main mosque in Moscow, Russia, Friday, Oct. 26, 2012. (AP Photo/Mikhail Metzel)

  • Some thousands of Russian Muslims perform Eid al-Adha prayers that mark the end of the holy fasting month of Ramadan outside the main mosque in Moscow, Russia, Friday, Oct. 26, 2012. (AP Photo/Mikhail Metzel)

  • Some thousands of Russian Muslims perform Eid al-Adha prayers that mark the end of the holy fasting month of Ramadan outside the main mosque in Moscow, Russia, Friday, Oct. 26, 2012. (AP Photo/Mikhail Metzel)

  • Muslims slaughter a cow during Eid al-Adha celebrations on a street in the city of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • EDS NOTE; GRAPHIC CONTENT - Muslims slaughter a cow during Eid al-Adha celebrations on a street in the city of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • Afghan National army soldier takes on a weapon during a patrol near prayers gather for Eid al-Adha near a mosque in the outskirt of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • Afghan National army soldiers take up their positions during a patrol near prayers gathered for Eid al-Adha at a mosque in the outskirt of Jalalabad east of Kabul, Afghanistan, Friday, Oct. 26, 2012. Eid al-Adha is a religious festival celebrated by Muslims worldwide to commemorate the willingness of Prophet Ibrahim to sacrifice his son as an act of obedience to God. (AP Photo/Rahmat Gul)

  • An Emirati man arrives at Farooq Omar Inb Al Khatab mosque to attend Eid Al-Adha prayers in Dubai, United Arab Emirates, Friday Oct. 26, 2012. (AP Photo/Kamran Jebreili)

  • An Emirati Imam, left, leads Eid Al-Adha prayers at Farooq Omar Inb Al Khatab mosque in Dubai, United Arab Emirates, Friday Oct. 26, 2012. (AP Photo/Kamran Jebreili)

  • An Emirati Imam, left, leads Eid Al-Adha prayers at Farooq Omar Inb Al Khatab mosque in Dubai, United Arab Emirates, Friday Oct. 26, 2012. (AP Photo/Kamran Jebreili)

  • SAUDI-RELIGION-HAJJ

    Muslim pilgrims pray on Mount Arafat, near the holy city of Mecca, ahead of the hajj main ritual, on October 25, 2012. Vast crowds of Muslim pilgrims, all dressed in white, flocked from early in the morning to Mount Arafat in Saudi Arabia's west to take part in the main rituals of the annual hajj. AFP PHOTO/FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)