People attend prayer outside the National Mosque during the Eid-al-Adha holiday in Dhaka, Bangladesh. Eid Al-Adha, known as the 'Feast of the Sacrifice', is one of the most significant festivals on the Muslim calendar and lasts for four days. The holiday marks the end of the Haji Pilgrimage and serves as a day to remember the Islamic profit Ibrahim, and his willingness to sacrifice of his son, Ismail (Ishmael) as an act of submission to Allah, before Allah intervened and gave Ibrahim a lamb to slaughter in the place of his son. On this day, Muslims in countries around the world start the day with prayer and spend time with family, offer gifts and often give to charity. It is customary for Muslim families to honour Allah by sacrificing a sheep or goat and sharing the meat amongst family members.