Dhul-Hijjah

Eid al-Adha, the Festival of Sacrifice, commemorates Prophet Abraham's willingness to sacrifice his son in obedience to Allah. Celebrated during Hajj on the 10th of Dhul-Hijjah, Muslims sacrifice animals and distribute meat to family, friends, and the poor.

The Hijri calendar is a lunar calendar of twelve months, four of them sacred, instituted as an era by the caliph Umar ibn al-Khattab and counted from the Hijra of 622 CE. It governs Islamic worship, festivals, and historical dating.