FIVE PRINCIPLES OF ISLAM H 1297 "Islam is based on five principles: Bearing witness that there is no god except Allah and that Muhammad is the Messenger of Allah. Establishing the prayer. Payment of the obligatory charity. Pilgrimage to the House of Allah. Fasting the month of Ramadan." R 1297 Bukhari and Muslim with a chain up to ibn Omar who related that the Messenger of Allah, praise and peace be upon him, said this.
1271- وعن ابن عمر رضي الله عنهما : أنَّ رسول الله صلى الله عليه وآله وسلم ، قَالَ : "بُنِي الإسْلاَمُ عَلَى خَمْسٍ : شَهَادَةِ أنْ لاَ إلهَ إِلاَّ اللهُ ، وَأنَّ مُحَمَّداً رسولُ اللهِ ، وَإقَامِ الصَّلاَةِ ، وَإيتَاءِ الزَّكَاةِ ، وَحَجِّ البَيْتِ ، وَصَوْمِ رَمَضَانَ" متفقٌ عَلَيْهِ .