Imam Reza (a.s.) informed Rayyan Ibn Shabeeb:
O son of Shabeeb! If you wish to weep over something
Then weep for Husain Ibn Ali Ibn Abi Talib (a.s.)
For indeed he was slaughtered like a lamb is slaughtered
And 18 men from his family were martyred along with him, the likes of whom this earth has not seen
And indeed the seven heavens and the earths wept over his martyrdom
And indeed, 40000 angels had descended on the earth for his help
But they found him (already) martyred
And since then they are at his grave, with their hair disheveled, filled with dust until the rise of the Qaem viz. Imam Mahdi (a.t.f.s.) and will be among his helpers
And their slogan is “Revenge for the blood of Husain (a.s.)”
O son of Shabeeb! If you weep for Husain (a.s.) such that your tears roll over your cheeks
Allah shall forgive all sins which you would have committed
Whether they (the sins) are small or big, few or many
O son of Shabeeb! If you wish to meet Allah, Mighty and Majestic be He, such that there is no sin upon you
Then visit (perform Ziyaarah) of Husain (a.s.)
O son of Shabeeb! If you wish to stay in a lofty place in Paradise alongside the Holy Prophet (s.a.w.a.)
Then curse the killers of Husain (a.s.)
[Behaar al-Anwaar, vol. 44, p. 286, H. 23 narrating from Al-Amaali of Shaikh Saduq (a.r.)]
May Allah hasten the reappearance of Imam Mahdi (a.t.f.s.) and include us among the avengers of the martyrdom of Imam Husain (a.s.). Aameen Yaa Rabb al-Aalameen!