sentences:  These include the works of Hariz ibn 'Abd Allah al-Sijistani and 'Ubaid Allah ibn 'Ali al-Halabi who were contemporaries of the Imam Ja'far al-Sadiq.They also included the works of Ali ibn Mahziyar; al-Husayn ibn Sa'id; and Ahmad ibn Muhammad ibn 'Isa (died 297 A.H.) who all heard the traditions of the Imams Ali Al-Ridha, Muhammad al-Jawad and al-Hadi.Other sources were the works of Muhammad ibn Yahya ibn 'Imran al-Ash'ari, Sa'd ibn 'Abd Allah (died about 300 A.H.) and Muhammad ibn al-Hasan (died 343 A.H.) Ibn Babawayh was taught by the latter.