Tasua and Ashura are the 9th and 10th day of Muharram which is the first month in the Islamic calender.
During the first ten days of Muharram especially On Tasua and Ashura, Iranian mourners hold special ceremonies in line with their local traditions in different cities and offer foods to at public venues like mosques.
The Day of Ashura is when Imam Hussein along with 72 of his companions was martyred in a battle in Karbala, Iraq, more than 14 centuries ago.
Ashura symbolizes the eternal struggle of truth against falsehood and the battle against injustice and cruelty realized by Imam Hussein as he offered supreme sacrifice to uphold the principles against tyranny.
Above painting depicts the family of Imam Hussain (peace be upon him), mourning when the Imam Hussain‘s Horse came back from the battle without his rider.