Ali ibn al-Hasan ibn Faddal, from Harun ibn Muslim, from Masadah ibn Sadaqah, from Abu Abdillah Imam Ja’far عليه السلام from his father, Imam al-Baqir عليه السلام, peace be upon them both: The Imams عليه السلام said: “Imam Ali عليه السلام, peace be upon him, said, ‘Fast Ashura, the ninth and the tenth (of Muharram), for it expiates the sins of a year.’”