All praise is due to Allah Almighty, and may the prayers be bestowed upon Mohammad and his pure progeny, along with the severest curses upon their enemies until the Day of Judgment.
Indeed, the love of Imam Hussain (a.s) is present in the heart of every Shi'i Muslim, and that the mystery behind the permanence of Shi'ism is its inspiration from the principles of the incident which took place in the holy land of Karbala on the day of Ashuraa'.
There are four people who are known to be better than Imam Hussain (a.s). These being his grandfather, the Messenger of Allah Almighty (saww), his father Imam Ali (a.s), his mother Fatimatul Zahra (a.s) and his brother Imam Hassan (a.s). Imam Hussain (a.s) stated in Karbala: “ My grandfather is better than me, my father is better than me, my mother is better than me and my brother is better than me, and for me and every Muslim is an excellent example in the Messenger of Allah Almighty ”.
However, the tragedy of Imam Hussain (a.s) gives rise to gatherings which entail mourning, weeping, rituals, feeding Muslims and other various services within the twenty four hours of the 10th of Muharram.
These rituals most evidently exceed those which take place for the tragedies of the other holy thirteen infallibles (a.s) throughout the entire year. It is apparent that the participants in the gatherings and rituals of Imam Hussain (a.s) are a lot greater in number and undoubtedly, this is due to the fact that it is only Allah Almighty who wishes for this to occur. He (swt) has made Imam Hussain (a.s) and his matter an exception, just as the Prophet (saww), Imam Ali (a.s), Fatimatul Zahra (a.s) and all the Imams (a.s) up until Imam Mahdi (a.s) had dealt with the incident of Ashuraa’ in an exclusive manner.
In regards to Imam Hussain (a.s), Imam Mahdi (a.s) said: “ And for you, I shall shed blood instead of tears”.
Imam Mahdi (a.s) mentioned the shedding of blood for his grandfather Al-Hussain (a.s), something which he (a.s) never expressed for any other from amongst his infallible forefathers (a.s) or even his grandmother Fatimatul Zahra (a.s).
It is therefore crystal clear that the matter of Imam Hussain (a.s) is exclusive in all aspects.
Source:
SECRETS BEHIND VISITING KARBALA
The Eminent Grand Islamic Authority and Jurist Ayatollah Sayid Sadiq Hussaini Shirazi