Sunni

Ashura is the tenth day of Muharram, the first month of the Islamic calendar. Sacred for its connection to Prophet Musa's deliverance and transformed by the martyrdom of Imam Husayn at Karbala in 680 CE, it is observed across all Islamic traditions.

The division between Sunni and Shia Islam, originating from disputes over leadership succession after Prophet Muhammad's death, evolved into distinct theological, legal, and political traditions that have shaped Islamic civilization.