Islam is based on five matters

والصَّلَاةُ والسَّلاَمُ عَلَى سَيّدِنَا مُحَمَّدٍ أَشْرَفِ اْلمُرْسَلِيْنَ وَعَلَى آلِهِ وَصَحْبِهِ الطَّيّبِيْنَ الطَّاهِرِيْن

From the route of Abu ^Abdi r-Rahman bin ^Umar bin Al-Khattab may Allah accept both of their deeds, who said: I heard the Messenger of Allah ﷺ  say: Islam is based on five matters: Testifying no one is God except Allah and that Muhammad is the Messenger of Allah, performing the prayers, paying Zakat, offering Pilgrimage to the glorified house and fasting Ramadan. Narrated by al-Bukhari and Muslim.