✅ Answer: Please refer to the following narrations:

1⃣عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْحَجَّاجِ قَالَ: قَالَ أَبُو عَبْدِ اللَّهِ مَنْ زَارَ قَبْرَ الْحُسَیْنِ لَیْلَةً مِنْ ثَلَاثٍ غَفَرَ اللَّهُ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ وَ مَا تَأَخَّرَ قُلْتُ أَیُّ اللَّیَالِی جُعِلْتُ فِدَاکَ قَالَ لَیْلَةُ الْفِطْرِ وَ لَیْلَةُ الْأَضْحَی وَ لَیْلَةُ النِّصْفِ مِنْ شَعْبَانَ.

📚 Al-Tahdhib, vol. 6, p. 49

📚 Kamal al-Ziyarat, p. 180

Abd al-Rahman ibn Hajjaj said: Imam Sadiq, peace be upon him, said: Whoever visits Imam Hussain, peace be upon him, on any of these three nights, Allah forgives their past and future sins! I asked, 'May I be your sacrifice! On which nights?' He replied: On the night of Eid al-Fitr, the night of Eid al-Adha, and the night of the middle of Sha'ban!

2⃣عَنْ یُونُسَ بْنِ ظَبْیَانَ قَالَ: قَالَ أَبُو عَبْدِ اللَّهِ مَنْ زَارَ قَبْرَ الْحُسَیْنِ لَیْلَةَ النِّصْفِ مِنْ شَعْبَانَ وَ لَیْلَةَ الْفِطْرِ وَ لَیْلَةَ عَرَفَةَ فِی سَنَةٍ وَاحِدَةٍ کَتَبَ اللَّهُ لَهُ أَلْفَ حَجَّةٍ مَبْرُورَةٍ وَ أَلْفَ عُمْرَةٍ مُتَقَبَّلَةٍ وَ قُضِیَتْ لَهُ أَلْفُ حَاجَةٍ مِنْ حَوَائِجِ الدُّنْیَا وَ الْآخِرَةِ.

📚 Kamal al-Ziyarat, p. 180

Imam Sadiq, peace be upon him, said: Whoever visits Imam Hussain, peace be upon him, on the night of the middle of Sha'ban, the night of Eid al-Fitr, and the night of Arafah in one year, Allah will write for them the reward of a thousand accepted Hajj, a thousand accepted Umrah, and will fulfill a thousand of their worldly and spiritual needs!

اللَّهُمَّ صَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْر

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