On the authority of Abu Abdul Rahmaan Abdullah, the son of Umar ibn al-Khattaab (may Allah be please with them both) who said: I heard the Messenger of Allah (peace be upon him) say: “Islam is built upon five [pillars]: testifying that there is none worthy of worship except Allah and that Muhammad is the Messenger of Allah, establishing the prayers, giving zakat, making pilgrimage to the House and fasting the month of Ramadhaan.”

Recorded by in Bukhari and Muslim.