Muslims celebrate two great Islamic holidays. The first is Eid al-Fitr, the Feast of the Breaking of the Fast of Ramadan, a celebration that extends for three days. The second holiday is the greater of the two. It occurs two and a half months after the first and lasts for four days. This is the Eid al-Adha, the Feast of Sacrifice, which marks the annual completion of the pilgrimage to Mecca (hajj). These holidays represent a religious obligation for Muslims as well as a social celebration.