Usul al-Kafi

(921–940)

The Usul al-Kafi is part of the Kitab al-Kafi, a multivolume collection of over sixteen thousand Hadith that were compiled between 921 and 940 by Abu Ja’far Muhammad ibn Ya’qub ibn Ishaq al-Kulayni al-Razi (known as al-Kulayni) in the city of Baghdad. Hadith are the sayings of the prophet Muhammad (the founder of Islam, born in 570) and, in some instances, the sayings of those Shia imams believed by the Shia to be direct successors to Muhammad.

The Sunni and Shia branches of Islam have separate collections of Hadith. The primary difference between the two is that whereas Sunni...

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