According to the history, once, he refused to accept the Islamic rules by the Yazid.
And he started revolting against him which gave rise to the Karbalan (a battle) during which he was beheaded whereas his family members were imprisoned in the Damascus.
Ibn e Abbas ra narrated: “When the Prophet came to Medina, he found (the Jews) fasting on the day of ‘Ashura’ (i.e. They used to say: “This is a great day on which Allah saved Moses and drowned the folk of Pharaoh.
Moses observed the fast on this day, as a sign of gratitude to Allah.” The Prophet said, “I am closer to Moses than they.” So, he observed the fast (on that day) and ordered the Muslims to fast on it.
And he got victory on the tenth day of the Muharram over the Pharaohs of Egypt.
Both factions of the Muslim community celebrate this day with almost identical traditions.It is based on the migration of the Prophet Muhammad (s.a.w) from Mecca to Medina in 622 AD.However, the use of the Hijri calendar began in AD 639 or 17 AH during the Khilafat of Syedna Umar Farooq (ra).Narrated by Aisha (ra): “The people used to fast on ‘Ashura (the tenth day of the month of Muharram) before the fasting of Ramadan was made obligatory.And on that day the Ka’ba used to be covered with a cover.When Allah made the fasting of the month of Ramadan compulsory, Allah’s Apostle said, “Whoever wishes to fast (on the day of ‘Ashura’) may do so; and whoever wishes to leave it can do so.”[Bukhari Vol 02, Book 026, Hadith Number 662] However, Rasul Allah saw used to fast on the day of Ashura even after fasting in Ramadan was made obligatory.Fasting on the day of Ashura expiates the sins of the previous year as told by our Prophet Muhammad saw. It is one of the four sacred months during which waging a war and fighting is not allowed.Allah says in the Holy Quran: “Surely the number of months with Allah is twelve months in Allah’s ordinance since the day when He created the heavens and the earth, of these four being sacred; that is the right reckoning; therefore be not unjust to yourselves regarding them.”[Surah 9 : At-Taubah, Verse 36] Prophet Muhammad (saw) informed us about the four sacred months in the following narration: “The year is of twelve months, out of which four months are sacred: Three are in succession Dhul-Qa’ da, Dhul-Hijja and Muharram, and (the fourth is) Rajab…” [Bukhari Vol 004, Book 054, Hadith 419 Muharram is the first month of the Islamic Hijri calendar.Muharram festival 2019 would be celebrated by the people of Islam religion all over the world on 10th of September Tuesday.Dates of the celebration may vary according to the place.