Quote from : From MTV to Mecca: How Islam Inspired My Life Book

the essence of the Hajj is Arafat. On the ninth day of the Hajj month all pilgrims gather on the great Plain of Arafat to offer their deepest heartfelt prayers. It’s a reminder of Resurrection, when everyone will stand “naked” before God on Judgement Day and nothing counts but our actions and their effects upon our soul’.