He was the first person to learn the Quran by heart. According to commentators there are at least three hundred verses in the Holy Quran which have an implied reference to Ali. After the Holy Prophet he was the chief judge among the early Muslims. He is regarded as the "Father of Fiqh". He is the first revivalist among the Muslims. He interpreted the doctrines of Islam and systematized them. He is regarded as the "Father of Sufism". All schools of Tasawwuff trace their origin to him.