Narrated Ibn ‘Umar: Allah’s Apostle said: Islam is based on (the following) five (principles):
- To testify that none has the right to be worshipped but Allah and Muhammad is Allah’s Apostle.
- To offer the (compulsory congregational) prayers dutifully and perfectly.
- To pay Zakat (i.e. obligatory charity)
- To perform Hajj. (i.e. Pilgrimage to Mecca)
- To observe fast during the month of Ramadan.
(Volume 1, Book 2, Number 7)