Eid al-Adha also called Feast of the Sacrifice, is an important 3-day religious holiday celebrated by Muslims worldwide to honor the willingness of the prophet Ibrahim (Abraham) to sacrifice his young first-born son Ismail (Ishmael) a as an act of submission to God and his son's acceptance of the sacrifice, before God intervened to provide Abraham with a ram to sacrifice instead. The 3 days and 2 nights of Eid al-Adha are celebrated annually on the 10th, 11th and 12th day of Dhu al-Hijjah, the twelfth and last month of the lunar Islamic calendar. Eid begins today. -- Paula Nelson ( 32 photos total)

A livestock market ahead of the sacrificial Eid al-Adha festival in Karachi, Oct. 24, 2012. Eid al-Adha, or the Feast of Sacrifice, honors Abraham's willingness to sacrifice his son Ishmael on the order of God, who according to tradition then provided a lamb in the boy's place. (Asif Hassan/AFP/Getty Images)

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