Without any doubt...

Without any doubt, the Imams (as) are the best of these persons and the implication is more apt for them. And also there is no doubt that avenging their blood and demanding their rights is the most obvious aspect of love and regard for them and the most prominent expression of devotion with them. Now that you know this I say: Avenging is having many levels and four grades: First: When the heir avenger is having power, rulership and authority.

And he orders those under him to kill the murderer and in this way the blood of the oppressed is avenged. Second: That he himself eliminates the killer. And Allah, the Mighty and the High would avenge the blood of the oppressed martyr, His Eminence, Husain bin Ali (as) in these two ways.

Because He, in fact, is the owner of the blood of His Eminence as mentioned in many Ziarats: “Peace be on you, O blood of Allah.” As for the first type: Since Allah, the Mighty and Sublime has ordered our master, His Eminence, Qaim (aj) that he should demand revenge for the blood of Imam Husain (as) – as mentioned in many Ziarats, and some of them we quoted in the chapter of Letter ‘Th’ – and in Kamil az-Ziaraat through his own chain of narrators it is mentioned regarding the statement of the Almighty Allah: “And whoever is slain unjustly, We have indeed given to his heir authority, so let him not exceed the just limits in slaying.” That the Imam said: “He is the Qaim of Aale Muhammad (as) who would arise and take revenge for the blood of Husain bin Ali (as).