Definition of Eid ul Adha

The Feast of Sacrifice, arab عيد الأضحى, (IDU ʿ l-Adha ) is in addition to the fast-breaking festival the greatest feast of Muslims around the world. It is celebrated at the climax of the hajj, the pilgrimage to the House of Allah (swt) in Mecca, which begins annually on the tenth day of the Islamic month of Dhu al-Hijja and lasts four days. Due to the Islamic lunar calendar, the Feast of Sacrifice takes its static place throughout the year, it moves in the solar calendar backwards to eleven days per year.
Although the festival of sacrifice, and the fast-breaking festival are the only biggest festivals of Muslims, they follow closely one after the other, namely about 70 days (2 months and 10 days). The fast-breaking festival, also known as the sweet Feast is celebrated at the end of Ramadan. Between these two parties are the month Shawwal and Dhul Qa’da.
The Feast of Sacrifice is celebrated to commemorate the Prophet Ibrahim (as), when he received the command of Allah to sacrifice his son Ismail. Herein, however, was a trial for him, which he accomplished honorably with Ismail.
The basis for the festival of sacrifice comes from the Quran from the Sura 2 Al Baqarah Ayah (verse) 196.
Imam Ahmad narrated that ‘Uqbah bin’ Amr (r) has said: “The Day of` Arafah (9th Dhul-Hijjah), the day of the sacrifice (10th of Dhul-Hijjah) and the days of Tashreeq (11-12-13) are our Eid (festival). These are days of remembrance, of eating and drinking.”
Just as the Eid Al Fitr, Eid ul Adha begins with two Rakah Sunnah followed by a khutba (sermon).
The word “Eid” appears in the Quran in Sura Al-Maida (The Table – No. 5) mentioned as a solemn feast.
The Eid al-Adha is celebrated annually on the 10th, 11th and 12th and final day of the Islamic month of Dhul-Hijjah (ذو الحجة) of the lunar Islamic calendar. The Eid al-Adha celebrations start after the Hajj, the annual pilgrimage to Mecca in Saudi Arabia by Muslims from around the world.