Hadith
The mosque stands on the site of the grave of Husayn ibn Ali, where he was martyred during the Battle of Karbalā in 680. Up to a million pilgrims visit the city to observe ‘Āshūrā, which marks the anniversary of Husayn ibn ‘Alī's death. There are many Shī‘ah traditions which narrate the status of Karbalā:
“Karbalā, where your grandson and his family will be killed, is the most blessed and the most sacred land on Earth and it is one of the valleys of Paradise.”
“God chose the land of Karbala as a safe and blessed sanctuary twenty-four thousand years before He created the land of the Kaaba and chose it as a sanctuary. Verily it will shine among the gardens of Paradise, like a shining star shines among the stars for the people of Earth.”
“Not one night passes in which Gabriel and Michael do not go to visit him .”
Read more about this topic: Imam Husayn Shrine