Why is there no mention about Hzt Imam Hussain's Sacrifice in your answers about 10th and 11th Muharram?
All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His Slave and Messenger.
We did not talk about the martyrdom of Al Hussain Ibn Ali on the day of Ashura because it was not inquired about in the question. What we believe is important about this day is the many innovations that are now practiced in it. As for the killing of Al Hussain Ibn Ali, these are no Islamic rules related to it even though it was an event which saddened and depressed all Muslims. Some people believe wrongly that this day should be celebrated by showing great sorrow, beating oneself … etc.
All this has nothing to do with Sharia. In fact, it is nothing but innovations in Islam which are forbidden. Muslims lived many sad events before the murder of Al Hussein, the most important being the death of Prophet Muhammad the death of Caliph Abu Bakr, may Allah be pleased with him, and the murder of the three other Caliphs. If the Muslims had to have some special rituals to show sadness and sorrow on the anniversary of these occasions, they would spend most of their lives in mourning. Such remembrances have nothing to do with the true religion. In fact, it is very far from the guidance and conduct of the Prophet . The Prophet lost seventy of his companions, among whom was his uncle Hamza, may Allah be pleased with him, in Uhud and a similar number in Bir Maonna and he did not make from any of the too days a yearly occasion to mourn or show sadness and grief.
Allah Knows best.