Imam Ali Ibn Musa Al-Radha (a.s) said
"O Ibin Shabeeb! If you want to weep
over something, weep over Al-Hussein Bin Ali Bin Abi Talib (PBUT), for he has been slaughtered as the way the ram is slaughtered and with him eighteen men of his household who have no one like them on earth have been killed. The seen skies and seven lands have wept over his kill. Four thousand angels have descended to earth to advocate him yet they found him killed; therefore, they stayed at his grave being disheveled and dusty until Al-Qa'em rises and then they will be of his advocates and their banner will be:" Revenge for Al-Hussein!"
O Ibin Shabee! My father has narrated to me from his father and from his grandfather (PBUT) that:" When my grandfather Al-Hussein (PBUH) was killed, the sky rained red blood and soil. O Ibin Shabeeb! If you weep over Al-Hussein until you tears roll on your cheeks, Allah shall forgive for you every sin you have committed if it was either small or big, or if your sins were either a few or numerous. O Ibin Shabeeb! If you become pleased by meeting Allah Almighty without holding sins, you must visit Al-Hussein (PBUH). O Ibin Shabeeb! If you become pleased by dwelling in the rooms built in Heaven with the Prophet and his Household (PBUT), then damn the killers of Al-Hussein (PBUH). O Ibin Shabeeb! If you become pleased by obtaining the rewards that the ones who martyred with Al-Hussein (PBUH), then say whenever mentioning him:" I wish I were with them for I would have won a great victory!" O Ibin Shabeeb! If you become pleased by being with us in the highest ranks in the heavens, then weep over our sorrows and be glad for our gladness and you must follow our Wilaya (Divine Leadership); for if a man took a rock as a leader, Allah would have stuck him with it on the Day of Resurrection."
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Ref; Amal Al-Sadouq p.192, Oyoun Akhbar Al-Rida (PBUH) vol.2 p.268, Al-Bihar vol.44, p.285/ vol.98 p.103, Iqbal Al-A'mal vol.3 p.28, Al-Awalem p.538, Wasa'el Al-Shia vol.7 p.346. — with Amir Reza Heydari.