The belief (Imaan) that there is no God to be worshiped except Allaah (the one God) and that Muhammad (peace and blessings of God be upon him) is his messenger. Performing the prescribed prayers ( Salaat ), five times a day. Fasting ( Siyaam ) once a year, from sunrise to sunset throughout the entire month of Ramadaan. Charity ( Zakaat ) which is paid to the poor and needy once every year. Hajj, which is the pilgrimage to Mecca once in a lifetime if one is physically able and can afford it financially.
Pillars are part of a building. The building in this case is the perfect human being who cares and protects the rights of all creations and fellow humans, thus establishing a society in which truth and justice and peace is supreme.
Zakaat purifies the soul from stinginess and miserliness, and accustoms people to being generous and helping the poor and needy. It will bring a great reward on the Day of Resurrection, just like other forms of worship. It is not burdensome, like man-made taxes; it is only 25 in every thousand, which the sincere Muslim pays willingly and does not try to evade or wait until someone chases him for it.