I heard the messenger of Allah ﷺ say: Verily, al-Islam is founded on five (pillars): testifying the fact that there is no god but Allah, establishment of prayer, payment of Zakat, fast of Ramadan and Pilgrimage to the House. (Using translation from Muslim 16d)  

قَالَ رَسُولُ اللهِ ﷺ بُنِيَ الْإِسْلَامُ عَلَى خَمْسٍ شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللهُ وَإِقَامِ الصَّلَاةِ وَإِيتَاءِ الزَّكَاةِ وَحَجِّ الْبَيْتِ وَصَوْمِ رَمَضَانَ  

I heard the messenger of Allah ﷺ say: Verily, al-Islam is founded on five (pillars): testifying the fact that there is no god but Allah, establishment of prayer, payment of Zakat, fast of Ramadan and Pilgrimage to the House. (Using translation from Muslim 16d)  

قَالَ رَسُولُ اللهِ ﷺ بُنِيَ الْإِسْلَامُ عَلَى خَمْسٍ شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللهُ وَإِقَامِ الصَّلَاةِ وَإِيتَاءِ الزَّكَاةِ وَصَوْمِ رَمَضَانَ وَحَجِّ الْبَيْتِ  

[Machine] Narrated Ibn Abbas, we do not know it except that he raised it to the Prophet ﷺ who said, "Islam is built on five pillars: testifying that there is no god but Allah, and that Muhammad is His messenger, prayer, fasting in Ramadan, and pilgrimage to the House (Kaaba) for those who are able. Whoever leaves one of them has disbelieved and permitted bloodshed."  

عَنِ ابْنِ عَبَّاسٍ ؓ وَلَا نَعْلَمُهُ إِلَّا رَفَعَهُ إِلَى النَّبِيِّ ﷺ قَالَ بُنِيَ الْإِسْلَامُ عَلَى خَمْسٍ شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللهُ وَالصَّلَاةِ وَصِيَامِ رَمَضَانَ فَمَنْ تَرَكَ وَاحِدَةً مِنْهُنَّ كَانَ كَافِرًا حَلَالَ الدَّمِ  

"عُرَى الإِسْلام وقواعِدُ الدِّين ثلاثَةٌ عليهِن أُسِّسَ الإِسلامُ - مَنْ تَرَكَ

وَاحِدَةً مِنْهُنَّ فَهُوَ بِهَا كَافِرٌ، حَلالُ الدَّم- شَهَادَه أَنْ لَا إِلَه إلا الله، والصَّلاةُ المكْتُوبَةُ، وصَوْمُ رَمَضَانَ".