Basis of Islam

Abdullah b. Umar رضي الله عنه narrated Prophet ﷺ said [meaning]: Islam is based on five things: (1) To testify that there is no God but Allah and Muhammad is His Slave and Messenger (2) To establish prayer (3) To pay zakat (poor-due) (4) To perform Hajj; and (5) To fast during (the month of) Ramadan. Bukhari and Muslim