In the Islamic calendar, the 10th day of Muharram holds great significance for Shia Muslims worldwide, as it marks Ashura, a solemn observance commemorating the martyrdom of Imam Hussain, the grandson of Prophet Muhammad. Ashura is a day of mourning and reflection for Shia Muslims, symbolizing the sacrifice and unwavering devotion of Imam Hussain. 

In 680 AD, during the Battle of Karbala, Imam Hussain and his followers valiantly stood against a tyrannical ruler, Yazid, sacrificing their lives for the principles of justice and truth. This event holds immense spiritual significance for Shia Muslims, who view Imam Hussain as a symbol of resistance against oppression and a model of steadfastness in the face of adversity.