Hadith No: 1
Al-Hakim al-Nisaburi - Al-Mustadrak ala al-Sahihayn
Book of Knowledge of the Companions (ra) - "Shut these doors except for the door of Ali"
Volume: (3) - Page Number: (125)
4688 - Abu Bakr Ahmad ibn Jaafar ibn al-Bazzaaz narrated to us in Baghdad, saying: Abdullah ibn Ahmad ibn Hanbal narrated to me, my father narrated to me, Muhammad ibn Jaafar narrated to us, from Awf, from Maymoon Abu Abdillah from Zayd ibn Arqam, who said: A group of the companions of the Messenger of Allah (peace be upon him and his holy progeny) had doors opening into the mosque. One day, he said, "Shut these doors except for the door of Ali." Then some people spoke about this, and the Messenger of Allah (peace be upon him and his holy progeny) stood up, praised Allah, and extolled Him, and then said: "As for what follows, I was commanded to close these doors, except for the door of Ali." Then one of you said in it, 'By Allah, I did not close anything nor open anything, but I was commanded to do something and I followed it.'" This is a hadith with a sound chain of transmission, and they did not include it in their collections.

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Reference: Al-Mustadarak ala al-Saheehain Book 3

Hadith No: 2
Al-Hakim al-Nishapuri - Al-Mustadrak ala al-Sahihain
Book of Knowledge of the Companions (ra) - The Prophet (peace be upon him and his holy progeny) gathered the People of His House and recited the verse of purification
Volume: (3) - Page Number: (132 > 134)
[The text is lengthy, so only the relevant excerpt is provided here]
4708 - Abu Bakr Ahmad ibn Ja'far ibn Hamdan al-Qutayi narrated to us in Baghdad from his original book, saying: Abdullah ibn Ahmad ibn Hanbal narrated to me, saying: My father narrated to me, saying: Yahya ibn Hammad narrated to us, saying: Abu 'Awaneq narrated to us, saying: Abu Balj narrated to us, from Amr ibn Maymun, who said:.... Ibn Abbas said: "And the Messenger (peace be upon him and his holy progeny) blocked the doors of the mosque with the exception of Ali's door," so he would enter the mosque in a state of major ritual impurity (janabah), as it was his only way, and he had no other route.

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Reference: Al-Mustadarak ala al-Saheehain Book 3