فلا تكون بعد علي بن الحسين عليه السلام إلا في الأعقاب وأعقاب الأعقاب.
Thus after Ali Ibn Husain (a.s) Imamate continued in his generations one after another.
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Source: Shaykh Muḥammad b. al-Ḥasan al-Ṭūsī
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