Hadith No: 1
Al-Muttaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Page Number: (603)
32910 - Ali ibn Abi Talib, Bab Hittah: Hittah: His statement, Mighty and Majestic be He, {And say, "Hittah" (Surah al-Baqarah 2:58)} means, "Remove from us our burdens." This is concluded (al-Mukhtar (108)) and the meaning is that Ali ibn Abi Talib is the way to the removal of sins. Whoever enters through him will be a believer, and whoever leaves through him will be a disbeliever.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11

Hadith No: 2
Al-Manawi - Fayd al-Qadeer Sharh al-Jami' al-Saghir - Letter 'Ayn - Ali Bab Hitta
Volume: (4) - Page Number: (356)
[The text is long, so only the relevant excerpt is provided here]
5592 - Ali Bab Hitta, meaning a way to shed sins (whoever enters through it) in the manner commanded, as indicated by His statement, blessed and exalted be He, in the story of the Children of Israel: {And when we said, "Enter this city" } (Surah Al-Baqarah 2:58) was a believer, and whoever exits from it was a disbeliever.

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Reference: Faiz al-Qadeer Sharh Jaame' al-Sagheer Book 4

Hadith No: 3
Al-Salihi al-Shami - Sabil al-Huda wa'l-Rashad fi Sirat Khayr al-Ibad
The Compilation of Chapters on the Ten Whom the Messenger of Allah (peace be upon him and his holy progeny) Testified to Being in Paradise and Some of Their Virtues
Chapter Ten: On Some of the Virtues of the Commander of the Faithful, Abu al-Hasan Ali ibn Abi Talib
Ibn Abd al-Muttalib ibn Hashim ibn Abd Manaf al-Qurashi al-Hashimi
Fourth: Regarding the Wisdoms, Sayings, and Poems Attributed to Him (peace be upon him and his holy progeny)
Volume: (11) - Page Number: (297)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And al-Daraqutni narrated in al-Ufrad from Ibn Abbas(peace be upon him and his holy progeny): that the Messenger of Allah (peace be upon him and his holy progeny) said: "Ali ibn Abi Talib is the Door of Pardoning; whoever enters through it is a believer, and whoever exits from it is a disbeliever."

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Reference: Sobol al-Huda wa al-Rashaad fi Seerah Khair al-'Ibaad Book 11

Hadith No: 4
Al-Qunduzi al-Hanafi - Yanabi' al-Muwaddah li-Dhi al-Qurbى
Volume: (2) - Page Number: (96)
232 - Ali at the Gate of Humility; whoever enters from it is a believer, and whoever exits from it is a disbeliever, al-Darqatani stated in al-Ifrad narrating from Ibn Abbas.

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Reference: Yanabie Almawadat Lidhuyi Alqurbaa Book 2

Hadith No: 5
Al-Qunduzi al-Hanafi - Yanabiu al-Mawadda li Dhawi al-Qurba
Volume: (2) - Page Number: (274)
785 - Ibn Abbas reported that Ali said: "At the Gate of Humility," "whoever enters it will be a believer, and whoever exits it will be a disbeliever."

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Reference: Yanabie Almawadat Lidhuyi Alqurbaa Book 2

Hadith No: 6
Al-Qanduzi al-Hanafi - Yanabi' al-Mawdah li-Dhawi al-Qurba
Volume: (2) - Page Number: (401)
46 - Al-Daraqutni narrated in al-Ifrad from Ibn Abbas that the Prophet (peace be upon him and his holy progeny) said, "Ali is at the Gate of Humility (Bab Hitta)." Those who enter it are believers, and those who leave it are disbelievers.

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Reference: Yanabie Almawadat Lidhuyi Alqurbaa Book 2