Haj is mentioned in the Hadith as one of the Pillars of Islam. Haj is an imperative duty (Fardh) for all Muslims who have the resources to carry it out. It is to be performed during the days of Haj, once in a lifetime. However, one may perform it more than once. Haj is an ibadah in which money is spent in Allah's way and strength is sacrificed for the pleasure of Allah. At the same time it is a test of patience. Haj also provides Muslims from all parts of the world the opportunity of meeting at a central venue to strengthen the bonds of Muslim Brotherhood.