Ibn Mahbub narrated from Ali ibn Ri'ab from Zurarah, who said: I asked Abu Jafar Imam Muhammad ibn Ali Al-Baqir عليه السلام about a man who accidentally killed another man during the sacred months (Ashhur Al-Hurum). Imam عليه السلام said: "He must pay the blood money (diyyah) and fast for two consecutive months from the sacred months." I said: "But this period includes Eid and the days of Tashriq (the days following Eid Al-Adha)." Imam عليه السلام replied: "He must still fast them, for it is an obligation that has become binding upon him."