The Messenger of Allah ﷺ said: "The most virtuous fasting after the month of Ramadan is Allah's month Al-Muharram." [at-Tirmidhi – Sahih]
In a crisp six minutes, Shaykh Yasir Qadhi enumerates the numerous significances associated with the month of Muharram. Few of these are:
Institution of the Calendar
Ashoora – drowning of Pharaoh
The Ark of Nuh (AS)
Fasting on Ashoora
The Tragedy at Karbala