Muhammad b. Musa al-Mutawakkil narrated to us. He said: `Ali b. al-Husayn Sa`d Abadi narrated to me from Ahmad b. Abi `Abdillah al-Barqi from his father from Muhammad b. Sinan from al-Mufaddal b. `Umar from al-Sadiq Ja`far b. Muhammad . He said: Islam was built on five pillars: prayer, zakat, fasting, Hajj, and the wilaya of Amir al-Mu’minin and the Imams from his descendants (s).