Islam is based upon five pillars

عَنِ ابْنِ عُمَرَ قَالَ قَالَ رَسُوْلُ اللہِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ

بُنِيَ الْإِسْلاَمُ عَلَى خَمْسٍ شَهَادَةُ أَنْ لَا إِلَهَ إِلاَّ اللہُ وَأَنَّ مُحَمَّدًا رَسُوْلُ اللهِ وَإِقَامُ الصَّلاَةِ وَإِيْتَاءُ الزَّكَاةِ وَصَوْمُ رَمَضَانَ وَحَجُّ الْبَيْتِ

Hazrat Ibn Umar^ra relates that the Holy Prophet^sa said:

“Islam is based upon five pillars: the testimony of ‘La ilaha illa-Allah’ [There is none worthy of worship escept Allah] and ‘Muhammad is the Messenger of Allah’, the establishment of Salat, giving Zakat, fasting [in the month of] Ramadan and performing Hajj.”

(Jami‘ al-Tirmidhi, Kitab al-Iman an Rasulullah^sa, Hadith 2609)