Shaykh Tusi (Persian: شیخ توسی), full name: Abu Jafar Muhammad Ibn Hassan Tusi (Persian: ابوجعفر محمد بن حسن توسی), known as Shaykh al-Taʾifah (Arabic: شيخ الطائفة) was a prominent Persian scholar of the Shi'a Twelver Islamic belief.
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