Chapter on the Virtue of Mosques and Prayer Within Them, and the Virtue of Congregational Prayer and Its Rulings

Muhammad ibn Ahmad from Ali ibn Isma’il from Muhammad ibn Amr ibn Sa’id who said: Musa ibn Ukayl narrated to me from Abd al-A‘la, the freed slave of the family of Sam, who said: I said to Abu Abdillah عليه السلام, peace be upon him: “How large was the mosque of the Messenger of Allah سبحانه وتعالى, peace be upon him and his family?” Imam عليه السلام said: “Three thousand and six hundred cubits, irregularly shaped.”