Hadith No: 1
Al-Nasa'i - al-Sunan al-Kubra - Book of Distinctions
Mentioning the Status of Ali ibn Abi Talib (peace be upon him) and His Closeness to the Prophet (peace be upon him and his holy progeny)
Volume: (7) - Page Number: (446)
8435 - Ismail ibn Mas'ud narrated to us, saying: Khalid narrated to us, from Shu'bah, from Abu Ishaq, from al-'Ala', who said: A man asked Ibn Umar about Uthman. He said: He was one of those who took charge on the day the two armies met, and Allah repented to him. Then he committed a sin, and they killed him. The man then asked him about Ali, and he said: Do not ask about him. Do you not see his position with the Messenger of Allah (peace be upon him and his holy progeny)?

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Reference: Al-Sunan al-Kubra Book 7

Hadith No: 2
Al-Nasa'i - al-Sunan al-Kubra - Book of Distinctions
Mentioning the Status of Ali ibn Abi Talib (peace be upon him) and His Proximity to the Prophet (peace be upon him and his holy progeny)
Volume: (7) - Page Number: (446)
8436 - Hilal ibn al-Ala ibn Hilal narrated to me, who said: Hussein narrated to us, who said: Zuhair narrated to us from Abu Ishaq from al-Ala ibn Arar, who said: I asked Abdullah ibn Umar, "Will you not tell me about Ali and Uthman?" He said: "As for Ali, this is his house, part of the house of the Messenger of Allah (peace be upon him and his holy progeny), and I will not speak to you about him except in this regard. As for Uthman, he committed a great sin on the Day of Uhud, but Allah forgave him, and he sinned among you in a minor matter, and you killed him."

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Reference: Al-Sunan al-Kubra Book 7

Hadith No: 3
Al-Nasa'i - al-Sunan al-Kubra - Book of Special Virtues
Mentioning the Status of Ali ibn Abi Talib (peace be upon him) and His Proximity to the Prophet (peace be upon him and his holy progeny)
Volume: (7) - Page Number: (447)
8437 - Ahmad ibn Sulayman narrated to us, saying: Ubaydullah narrated to us, saying: Isra'il narrated to us from Abu Ishaq, from al-'Ala' ibn 'Arar, who said: I asked Ibn Umar while he was in the Mosque of the Messenger of Allah (peace be upon him and his holy progeny) about Ali and Uthman. He said: As for Ali, do not ask me about him; rather, look at his place from the Messenger of Allah (peace be upon him and his holy progeny). There is no house in the mosque except for his. As for Uthman, he committed a great wrong on the day the two groups met, but Allah forgave him and absolved him. He committed a sin among you that was lesser, and you killed him.

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Reference: Al-Sunan al-Kubra Book 7