Hadith No: 1
Ahmad ibn Hanbal - Fada'il al-Sahabah (Virtues of the Companions) - Regarding the Virtues of Ali (peace be upon him)
Volume: (2) - Page Number: (624)
1068 - Muhammad ibn Yunus narrated to us, who said: Ubaydullah ibn A'isha narrated to us, from Isma'il ibn Amr, from Umar ibn Musa, from Zayd ibn Ali ibn Husayn, from his father, from his grandfather from Ali ibn Abi Talib, who said: "I complained to the Messenger of Allah (peace be upon him and his holy progeny) about the people’s envy of me, and he said: 'Do you not wish to be the fourth of four: the first to enter Paradise will be me, you, Hasan, and Husayn.' Our wives will be on our right and our left, and our descendants will be behind our wives, and our followers will be behind us."

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Reference: Fazael al-Sahabah Book 2

Hadith No: 2
Al-Haythami - Majma' al-Zawa'id wa Manba' al-Fawa'id - Book of Virtues
Chapter on the Virtues of Ali ibn Abi Talib (ra) - A Comprehensive Chapter on Those Who Love Him and Those Who Bear Him Ill Will
Volume: (9) - Page Number: (131)
14751 - And with his chain of narrators: That the Messenger of Allah (peace be upon him and his holy progeny) said: "The first four to enter Paradise will be me, you, and Hassan and Hussein," and our offspring will be behind our backs, our spouses behind our offspring, and our Shi'a on our right and on our left.

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Reference: Majma al-Zawaaed wa Mamba' al-Fawaaed Book 9

Hadith No: 3
Al-Tabarani - al-Mu'jam al-Kabir - Chapter on the letter Alif - Ubaydullah ibn Abi Rafi' from his father
Volume: (1) - Page Number: (319)
950 - And with his isnad: that the Messenger of Allah (peace be upon him and his holy progeny) said to Ali: "Indeed, the first four to enter Paradise will be me, you, Hasan, and Husayn," and our descendants will be behind our backs, our spouses will be behind our descendants, and ourShi'ah will be on our right and left sides.

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Reference: al-Mo'jam al-Kabeer Book 1

Hadith No: 4
Al-Tabarani - al-Mu'jam al-Kabir - Chapter on the Letter Ha - Remaining Narrations about al-Hasan ibn Ali (RA)
Volume: (3) - Page Number: (41)
2624 - Ahmad ibn Muhammad al-Marri al-Qanitari narrated to us, saying: Harb ibn al-Hasan al-Tahhan narrated to us, saying: Yahya ibn Ya'la narrated to us from Muhammad ibn Ubaydullah ibn Abi Rafi, from his father, from his grandfather, that the Messenger of Allah (peace be upon him and his holy progeny) said to Ali (RA): "The first four to enter Paradise will be me, you, al-Hasan, and al-Husayn," and our descendants will be behind us, and our wives will be behind our descendants, and our Shia will be on our right and on our left.

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Reference: al-Mo'jam al-Kabeer Book 3

Hadith No: 5
Ibn al-A'rabi - Ma'jam Ibn al-A'rabi
Volume: (1) - Page Number: (300)
575 - Narrated to us by al-Ghalabi, from Ibn 'A'yishah. He narrated to us from Isma'il ibn Amr al-Bajjali, from Amr ibn Musa, from Zayd ibn Ali, from his ancestors from Ali, who said: "I complained to the Messenger of Allah (peace be upon him and his holy progeny) about the people's envy of me, and he said: 'O Ali, will you not be pleased that the first four to enter Paradise will be me, you, Hasan, and Husayn', with our wives on our right and left, and our descendants behind our wives, and our supporters behind us."

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Reference: Mo'jam Ibne Aaraabi Book 1