Regardless of their different languages, races and backgrounds, they are united on one matter; the love of Imam al-Hussayn (peace be upon him) and being present in the spiritual atmosphere of faith and purity in Karbala of Imam al-Hussayn and his brother Aba al-Fadl al-Abbas (peace be upon him), whose holy shrines were packed since the afternoon by large numbers of visitors coning to perform the rituals of the Ziyarat of 'Arafah day.
It is narrated that the Ziyarat of Imam al-Hussayn (peace be upon him) is the most important act on this day, The Almighty God looks at the visitors of Imam Al-Hussayn (peace be upon him) on the day of 'Arafah before looking at the standing on the mount of 'Arafah.. Yes this is the least that Aba Abdillah (peace be upon him) deserves, as without his holy revolution and sacrifice, 'Arafah and Hajj will be forgotten. So the Almighty upheld the matter of the master of martyrs (peace be upon him) as he was the one who respected the saint house when the Umayyad planned to shed the sacred blood in the sacred house on the sacred month. This is why it is one of the greatest Eids even though it wasn't called a Eid, it is a day in which Allah has called his slaves to obey and worship Him and has extended to them tables of kindness and generosity, Satan during it is vile, wretch and angry more than any other time.
Imam as-Sadeq (peace be upon him said: He who visits the tomb of al-Hussayn (peace be upon him) on the day of 'Arafah, he shall be granted to reward of thousand of thousand Hajj with the al-Qa'im -i.e. Imam al-Mahdi (peace be upon him and may Allah hasten his holy reappearance)- and thousand of thousand 'Umrah with the Messenger of Allah (prayers and Allah's peace be upon him and his holy Household), freeing thousand of thousand [one million] slaves, equipping thousand of thousand of horses in the path of Allah and the Almighty God will call him: He is my servant who has testified to My Promise and is certain about it.’ The angels shall proclaim, ‘So and so is the testifying servant. Allah has purified and cleansed him over His Arsh.’ On the earth, he shall be called as Karubi."