Chapter on Itikaf and What Fasting Is Obligatory in It

Ali ibn al-Hasan narrated that, from Ahmad ibn Sabih, from Ali ibn Imran, from Abu Abdillah Imam Ja’far عليه السلام from his father, Imam al-Baqir عليه السلام, peace be upon them both: Imam عليه السلام said: “The one observing seclusion for worship (al-mutakif) observes seclusion for worship (yatakif) in the congregational mosque.”