Reward of tears for Imam Hussein (as)

Hazrat Imam Mohammad al-Baqir (as) narrates from his father Imam Ali ibn Hussein Zain-ul-Abedeen (as) who said:

“If a believer weeps over the martyrdom of Imam Hussein (as) and tears flow from his eyes and fall on his cheeks, then Allah will make him reside in the palaces of Paradise where he shall abide for a lengthy period of time. And if tears flow from a believer’s eye (in sorrow) and falls upon his cheeks for the oppression and tyranny which has been inflicted upon us by our enemies, then Allah will present him a seat in Paradise. And the believer who undergoes sufferings on our behalf and tears flow on his cheeks, then Allah will remove sorrow from his face, and on the day of judgment will keep him away from His wrath and safeguard him against the fire (of hell)." 

Other links:

Anger

Famous Sayings of Holy Prophet Muhammad (saw) on Imam Ali(as)

Act upon knowledge