Witnessing Salatza during Hajj, Islam is built on five foundations. You can not become a Muslim unless you fully accept and practice it with true faith and sincerity. Concerning the son of Ummer, he said: The Messenger of Allah said: "Islam is built on the five principles of witnessing that there is no Lord, the only true worshiper is Allah, and Muhammad is the Messenger of Allah, performing Salat (worship), offering prayers, cutting Hajj and fasting." (Reporting by Al Pukhari and Muslims) Fundamentals of Islam Lesson 1: The Foundations of Islam and the Foundations of Faith The Foundations of Islam and the Foundations of Faith