"the tenth day of Dhul-Hijjah"
Eid ul-Adha Sacrifice
Creative Commons AttributionEid ul-Adha Sacrifice - Credit: amrufm, Flickr
The ten days of Dhul-Hijjah are considered sacred in Islam. It is a time for increased reflection, seeking Allah's forgiveness and doing good. According to the Prophet Muhammad, “There are no days in which righteous deeds are more beloved to Allah than these ten days." Fasting is particularly encouraged on the ninth day of Dhul-Hijjah (Day of Arafah). Fasting on this day will expiate a Muslim's sins for two years.The day of Arafah is the day when the pilgrims stand in worship on the Mountain of Arafah.

Generally, all good deeds are rewarded highly at this blessed time. These  include praying, reading the Qur'an, making Du'a (supplication), giving alms and being good to families.  Seeking Allah's forgiveness (istighfar) and Tawbah (repentance) at this time are also encouraged.  The tenth day of Dhul-Hijjah is Eid ul-Adha or the day of an-Nahr (slaughtering). It marks the conclusion of the major rites of Hajj, and commemorates Allah’s bounty on Prophet Ibrahim, when He gave him a ram to sacrifice instead of his son.