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Shi ' a Muslims do not use the six major hadith collections followed by the Sunni.

Instead, their primary collections were written by three authors known as the ' Three Muhammads '.

They are: Kitab al-Kafi by Muhammad ibn Ya ' qub al-Kulayni al-Razi ( 329 AH ), Man la yahduruhu al-Faqih by Muhammad ibn Babuya and Al-Tahdhib and Al-Istibsar both by Shaykh Muhammad Tusi.

Unlike Akhbari Twelver Shi ' a, Usuli Twelver Shi ' a scholars do not believe that everything in the four major books is authentic.

In Shia hadith one often finds sermons attributed to Ali in The Four Books or in the Nahj al-Balagha.