Imam Sadiq (pbuh) said:"whoever visited the grave of Al-Hussein (pbuh) on one of these three nights, Allah will forgive all his previous sins and those that will come, on the eve of
Al-Fitr, Al-Adha and 15th of Shaaban"
And in another narration from Imam Al-Sadeq:" And he who visits him on a holiday (EID), a hundred pilgrimage, a hundred Omra and a hundred battle with a messenger prophet and a just Imam
will be written for him."
Imam Sadiq (PBUH) said:"whoever visited the grave of Al-Hussein bin Ali (PBUT) on the eve of 15th of Shaaban, the eve of Al-Fitr and the eve of Arafa in the same year, Allah will has
written down that he has done a thousand Pilgrimages (Hajj), a thousand accepted Omra, and Allah will satisfy a thousand needs for him in this world and the last."
Imam Mousa Al-Kazim (PBUH) said:"Whoever visited the grave of Al-Hussein (PBUH) on these three nights Allah will forgive all his sins: the eve of 15th of Shaaban, 23th of Ramadan and the
eve of Eid Al-Fitr."
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أمالي الشيخ الصدوق ص206، أمالي الشيخ الطوسي ص201، كامل الزيارات ص316، ثواب
الأعمال ص89، عنهم البحار ج98 ص85، الكافي ج4 ص580، من لا يحضره الفقيه ج2 ص580، تهذيب الأحكام ج6 ص46، روضة الواعظين ص149، وسائل الشيعة ج10 ص358، مستدرك الوسائل ج10 ص282.
Amali Al-Sadouq p.206, Amali Al-Tousi p.201, Kamil Al-ziarat p.316, Thawab Al-A'amal p.89, Al-Bihar vol.98 p.85, Al-Kafi vol.4 p.580, Man La Yahdarouhou Al-Faqeeh vol.2 p.580, Wasa'il
Al-Shia vol.10 p.358, Tahtheeb Al-Ahkam vol.6 p.46, Rawdat Al-Wa'izin p.149.
إقبال الأعمال - ج 1 ص 383 : البحار 101 : 100/ 98 : 166 « كامل الزيارات، ص: 171
Iqbal Al-Aamal vol.1 p.383, Al-Bihar vol.101 p.100