Muzdalifah (Arabic: مزدلفة) is an open, level area near Mecca in Saudi Arabia associated with the Hajj. It lies just southeast of Mina on the route between Mina and Arafat.
The stay at Muzdalifah is preceded by a day at Arafat, consisting of glorifying Allah, repeating the Supplication, and repentance to Allah and asking Him for forgiveness. In Arafat, one must recite the Zuhr and 'Asr prayers in a combined and abbreviated form during the time of Zuhr. After sunset on the ninth day of the Islamic month of Dhu al-Hijjah, pilgrims travel to Muzdalifah, sometimes arriving at night because of over-crowding.
At Muzdalifah, pilgrims collect pebbles (21, because seven are thrown at each of the three pillars) which will be thrown in the Stoning of the Devil ritual in Mina during the next three or four days. Pilgrims then spend the night at Muzdalifah, often sleeping in the open air, before leaving for Mina the next morning.
The open-roofed mosque at Muzdalifah is known as Al-Mash'ar al-Haram ("The Sacred Grove").