The story behind the day
Eid al-Adha, the Festival of Sacrifice, begins on the tenth of Dhū al-Ḥijja, the day after the pilgrims' standing at ʿArafāt, and may run for up to four days. It recalls the willingness of Ibrahim (Abraham) to sacrifice his son at God's command, and God's sparing of the son. Muslims keep it with a special congregational prayer and, for those who can afford it, the sacrifice of a sheep, goat, cow or camel, whose meat is shared with the household, as gifts and as charity. Sunni and Shia Muslims keep the festival together.[1–6]
Origins

The Qur'an tells how Ibrahim saw in a dream that he must sacrifice his son, and how the son answered, "Do as you are commanded." Muslims usually understand the son to be Ismail, whereas Genesis names Isaac. Egypt's Dar al-Ifta says the sacrifice of the festival commemorates Ibrahim's offering and God's sparing of his son, and according to religious tradition, as the Congressional Research Service puts it, God intervened and a sheep was sacrificed in the son's place.[2, 8]
What it marks
The feast joins the end of the Hajj to an act of obedience and generosity. On the tenth of Dhū al-Ḥijja the pilgrims return to Mina to cast stones at pillars that symbolise the temptations of Satan, and they and Muslims elsewhere approach God by sacrificing an animal and giving its meat to the poor. Charity is a central part of the festival, and Muslims are encouraged to give during it.[7, 9–10]
How it came to be
Egypt's Dar al-Ifta relates that on reaching Medina the Prophet found its people keeping two festivals of pagan origin, and replaced them with the day of breaking the fast and the day of sacrifice; a report in Sunan Abu Dawud has him say that God gave believers something better than those two days of play. Muslims believe he introduced both Eids. In Sunni law the days for slaughtering the animal run from the day of Eid through the three days after it, which is why the festival is said to last up to four days.[1, 11]
How it is kept

The day opens with a congregational prayer in a mosque or an open prayer ground. Those who can afford it then sacrifice a sheep, goat, cow or camel. By Dar al-Ifta's rulings, which Islam Q&A echoes, the animal must be free of defects and of a minimum age, and a camel must be five years old. The meat is customarily divided in three: one part for the household, one as gifts, one as charity. People greet one another with Eid Mubarak and may send cards.[3–5, 12–13]
Across traditions
Fasting on the day itself is forbidden in Sunni and Shia law alike. Sunni jurists differ on how binding the Eid prayer is: Malikis and Shafiʿis call it a confirmed sunnah, Hanbalis a duty of the community, and Hanafis an obligation on each man. Twelver Shia law, which held it obligatory in the presence of the Imam, now treats it as recommended during his occultation, to be said in congregation or alone.[14–16]
Sources
Each statement above was checked against published sources; the verdict says whether it stood as written, was corrected or was hedged.
- VerifiedThe Open University; Dar al-Ifta al-Misriyyah, fatwa 2146; Islam Q&A, Conditions of Udhiyah.
- VerifiedQuran.com, Qur'an 37:102; The Open University; Congressional Research Service, Muslim Holidays: Fact Sheet; Encyclopedia.com.
- VerifiedThe Open University; Dar al-Ifta al-Misriyyah, The book of fasting.
- VerifiedThe Open University; Dar al-Ifta al-Misriyyah, Offering Udhiyah is a confirmed sunnah.
- CorrectedDar al-Ifta al-Misriyyah, fatwa 6255; The Open University.
- VerifiedCongressional Research Service, Muslim Holidays: Fact Sheet; Encyclopedia.com.
- CorrectedLibrary of Congress; Encyclopedia.com; Congressional Research Service, Muslim Holidays: Fact Sheet.
- VerifiedDar al-Ifta al-Misriyyah, fatwa 2146; Congressional Research Service, Muslim Holidays: Fact Sheet.
- CorrectedLibrary of Congress; Encyclopedia.com.
- VerifiedThe Open University; Library of Congress.
- CorrectedDar al-Ifta al-Misriyyah, The book of fasting; alim.org; The Open University.
- CorrectedDar al-Ifta al-Misriyyah, Offering Udhiyah is a confirmed sunnah; Islam Q&A, Conditions of Udhiyah.
- VerifiedCongressional Research Service, Muslim Holidays: Fact Sheet; The Open University.
- VerifiedDar al-Ifta al-Misriyyah, The book of fasting; Office of Ayatollah al-Sistani, Islamic Laws, ruling 1707.
- CorrectedIslamOnline, Rulings on Eid; Islam Q&A, answer 48983; Dar al-Ifta al-Misriyyah, The book of fasting.
- VerifiedOffice of Ayatollah al-Sistani, Islamic Laws, ruling 1495; Office of Ayatollah Safi Golpaygani, Islamic Laws.
