Sahih Bukhari

Allah's Messenger (ﷺ) said: Islam is based on (the following) five(principles):1. To testify that none has the right to be worshipped but Allah andMuhammad is Allah's Messenger (ﷺ).2. To offer the (compulsory congregational) prayers dutifully andperfectly.3. To pay Zakat (i.e. obligatory charity) .4. To perform Hajj. (i.e. Pilgrimage to Mecca)5. To observe fast during the month of Ramadan.