Hadith No: 1
Ahmad ibn Hanbal - Fada'il al-Sahabah - And among the virtues of Ali (peace be upon him)
And among the virtues of Ali (may Allah be pleased with him) from the narration of Abu Bakr ibn Malik through his teachers, except for Abdullah
Volume: (2) - Page Number: (765)
1154 - Ahmad ibn Isra'il narrated to us, who said: I saw in the book of Ahmad ibn Muhammad ibn Hanbal, may Allah have mercy on him, in his own handwriting: Uswad ibn Amir, Abu Abd al-Rahman, narrated to us: al-Rabi ibn Mundhir narrated to us from his father, who said: Hussein ibn Ali would say: "Whoever's eyes shed a tear for us or spills a drop for us, may Allah Almighty grant him a place in Paradise."

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Reference: Fazael al-Sahabah Book 2

Hadith No: 2
Al-Tabari - Dhakha'ir al-'Uqba fi Manaqib Dhawi al-Qurbā
Volume One: Regarding What Was Narrated About Relatives in General and Overall
Mentioning Those Whom It Is Painful for Them
Part: (1) - Page Number: (19)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... from al-Rabi' ibn Mundhir, from his father, who said: Hussein ibn Ali (may Allah be pleased with him and his father) would say: "Whoever's eyes weep for us with a tear or two from their eyes falls under the mercy of Allah, Mighty and Majestic be He, and Allah, the Almighty, will grant him Paradise." Ahmad narrated this in al-Manaqib.

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Reference: Dhakhayir Al Uqbaa Fi Manaqib Dhi alqurbaa Book 1

Hadith No: 3
Al-Tabari - Dhakhair al-Uqba fi Manaqib Dhawi al-Qurbى
Part One: Regarding What Was Mentioned About Kinship in a General and Summary Manner
Mention of What Was Said About Visiting the Grave of Hussein ibn Ali (peace be upon him and his holy mother)
Volume: (1) - Page Number: (151)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... from Musa ibn Ali al-Ridha ibn Ja'far, who said: Ja'far ibn Muhammad was asked about visiting the grave of Hussein. He replied: My father told me that whoever visits the grave of Hussein (peace be upon him) with knowledge of its right, Allah will write for him in Aliyyin. He also said: There are seventy thousand angels, disheveled and dusty, mourning over him around the grave of Hussein until the Day of Resurrection. This was narrated by Abu al-Hasan al-Atiqi.

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Reference: Dhakhayir Al Uqbaa Fi Manaqib Dhi alqurbaa Book 1

Hadith No: 4
Muhammad Bayoumi - Lady Fatimah al-Zahra (peace be upon her)
Volume: (1) - Page Number: (49)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Among them were thirty-five: Imam Ahmad narrated in al-Fada'il, and Muhammad ibn Tabari in al-Dhakha'ir, saying: Ahmad ibn Israel narrated to us, saying: I saw in the book of Ahmad ibn Muhammad ibn Hanbal, may Allah have mercy on him, in his own handwriting .... He said: Al-Husayn ibn Ali would say: "Whoever sheds tears from his eyes for us or lets fall a single tear, Allah, the Almighty, will grant him a place in Paradise."

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Reference: Al-Sayyedah Fatimah al-Zahra Book 1

Hadith No: 5
Al-Qunduzi al-Hanafi - Yanabi' al-Mawdah li-Dhawi al-Qurba
Volume: (2) - Page Number: (117 373)
337 - And from al-Rabi' ibn al-Mundhir, from his father, who said: Hussein ibn Ali (may peace be upon them) used to say: "Whoever's eyes shed a tear for us, even if just one tear, Allah, the Exalted, will grant him Paradise." Ahmad narrated it in al-Manaqib.
56 - And from Hussein ibn Ali (may peace be upon them) who said: "Whoever's eyes shed a tear for us, or even if his eyes release a drop for us, Allah, the Almighty, will grant him a place in Paradise." Ahmad narrated it in al-Manaqib.

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Reference: Yanabie Almawadat Lidhuyi Alqurbaa Book 2

Hadith No: 6
Ba Kathiir al-HaDurami - Wasiilat al-Maal
Volume: (1) - Page Number: (60)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... He said: And narrating from al-Rabi' ibn al-Mundhir, from his father, who said: Al-Husayn ibn Ali (may Allah be pleased with them both) would say: "Whoever's eyes brim with tears for us or sheds a single tear for us, Allah will grant him or, in another narration, Allah will prepare for him a place in Paradise." Ahmad narrated this in al-Manaqib.

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Reference: Wasilatul Maal Book 1