The Day of Arafah, the ninth of Dhu al-Hijjah, is the central day of the Hajj and, in a much-quoted saying, "the Hajj is Arafah": a pilgrim who fails to reach the plain of Arafat, east of Mecca, on this day has not performed the pilgrimage. There the assembled pilgrims spend the afternoon in the standing (wuquf), in prayer and supplication before God, an act understood as the emotional and spiritual summit of the whole pilgrimage and, in Islamic reflection, a foreshadowing of humanity standing before God on the Day of Judgement. It was on this day, at this place, that tradition holds the Prophet delivered his Farewell Sermon.
For Muslims not on pilgrimage, the day is one of the most meritorious for voluntary fasting, held in a widely reported hadith to expiate the sins of the year before and the year after. It falls the day before Eid al-Adha, so that the standing at Arafah and the feast of sacrifice form a single sequence: the pilgrims move that night to Muzdalifah and then to Mina for the stoning and the sacrifice, while the wider community keeps the fast and then the feast. Arafah thus binds the pilgrim minority and the fasting majority into one observance.