Pillars of Islam
أَرْكَانُ الإِسْلَامِ
أَرْكَانُ الإِسْلَامِ خَمْسَةٌ: شَهَادَةُ أَنْ لَا إِلَهَ إِلَّا اللهُ وَأَنَّ مُحَمَّدًا رَسُوْلُ اللهِ، وَإِقَامُ الصَّلَاةِ، وَإِيْتَاءُ الزَّكَاةِ، وَصَوْمُ رَمَضَانَ، وَحِجُّ الْبَيْتِ لِمَنِ اسْتَطَاعَ إِلَيْهِ سَبِيْلًا.
Translation
There are five pillars of Islam: (1) Testifying that there is no god but Allah and Muhammad is His messenger, (2) Establishing prayer, (3) Paying zakat, (4) Fasting in Ramadan, (5) Hajj for those who are able.
Commentary
The five pillars of Islam are the foundation of the religion. The shahada is a pledge of faith, prayer is a pillar of religion, zakat is a cleanser of wealth, fasting is a shield from lust, and the hajj is the completion of Islam. Gabriel's hadith is the main argument.