Muslim pilgrims arrive at the plain of Arafat, near Mecca December 18, 2007. Haj pilgrims will spend the day on the plain where the Prophet Mohammad gave his farewell sermon 14 centuries ago before moving back to Mena for the pillar-stoning rites that marks the beginning of the Eid al-Adha holiday. REUTERS/Ali Jarekji (SAUDI ARABIA)