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 - Isma'il 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 groups met, and Allah then accepted his repentance. Then he committed a sin and they killed him. The man asked him about Ali, and he replied: Do not ask about him; do you not see his status 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 Special Qualities
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, saying: Al-Husayn narrated to us, saying: Al-Zuhair narrated to us, from Abu Ishaq, from al-'Ala ibn 'Arar, who said: I asked Abdullah ibn Umar, "Would you not tell me about Ali and Uthman?" He said: "As for Ali, this is his house, one of the houses of the Messenger of Allah (peace be upon him and his holy progeny), and I will not speak to you about him from anything other than this. As for Uthman, he committed a great sin on the Day of Uhud, but Allah forgave him. 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 Traits
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: (447)
8437 - Ahmad ibn Sulayman narrated to us, saying: Ubaydullah narrated to us, saying: Israel narrated to us, from Abu Ishaq, from al-Alai 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 replied: As for Ali, do not ask me about him, but 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 his. And as for Uthman, he committed a grave sin on the day the two groups met, but Allah forgave him and pardoned 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