According to Sunni Muslims, fasting on Ashura, the tenth day of the Islamic month of Muharram was a practice established by Muhammad in the early days of Islam that commemorates the parting of the Red Sea by Moses.While in Shia Islam, Muharram is a month of remembrance. Ashura is well known in Shia tradition because of its historical significance and mourning for the Shahadat (martyrdom) of Ḥusayn ibn Ali, the grandson of Muhammad.