Harun ibn Muslim, from Ibn Abi Umayr, from Salih ibn Abdillah, who said: I (narrator) said to Abu al-Hasan Musa عليه السلام, peace be upon him: “Indeed, my brother was imprisoned, so I made upon myself the fasting of a month. So I fasted, but sometimes some of my brothers would come to me so that I would break the fast, and I broke the fast for some days. Should I make it up” Imam عليه السلام said: “There is no harm.”