 First, through the Asharis tribe at the end of the 7th and during the 8th century.Second through the pupils of Sabzevar, and especially those of Al-Shaykh Al-Mufid, who were from Rey and Sabzawar and resided in those cities.Third, through the school of Hillah under the leadership of Al-Hilli and his son Fakhr al-Muhaqqiqin.