Chapter on Itikaf and What Fasting Is Obligatory in It

And from him, from Muhammad ibn al-Walid, from Aban ibn Uthman, from Yahya ibn Abi al-Ala al-Razi, from Abu Abdillah عليه السلام, peace be upon him: Imam عليه السلام said: “There is no seclusion for worship (itikaf) except in a mosque of congregation.”