Tasu'a
Tasu'a (Arabic: تاسوعاء, romanized: Tāsūʿāʾ) is the ninth day of Muharram, the first month of the Islamic calendar. Tasu'a is followed by Ashura, tenth of Muharram, which marks the death of Husayn ibn Ali, a grandson of the Islamic prophet Muhammad and the third Shia imam.