Hadith No: 1

Narrated Ibn `Abbas: `Umar said, "Our best Qur'an reciter is Ubai and our best judge is Ali (as); and in spite of this, we leave some of the statements of Ubai because Ubai says, 'I do not leave anything that I have heard from Allah's Messenger (s.a.w.a.) while Allah: "Whatever verse (Revelations) do We abrogate or cause to be forgotten but We bring a better one or similar to it." (2.106)

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Reference: Saheeh al-Bukhari Book 65 Tradition No. 8

Hadith No: 2
Ahmad ibn Hanbal - Musnad Imam Ahmad ibn Hanbal
Musnad al-Ansar (ra) - Hadith of Abu al-Mundhir Ubay ibn Ka'b (ra)
Volume: (5) - Page Number: (113)
20581 - Wuqay' narrated to us, saying: Sufyan narrated to us, from Habib ibn Abi Thabit, from Sa'id ibn Jubayr, from Ibn Abbas who said: Umar (ra) said, "Ali is our best judge (qadi)," and Ubay is our best reciter (qari). We would be neglecting much of Abu's grammatical errors (lahan), and Abu would say, 'I heard from the Messenger of Allah (peace be upon him and his holy progeny),' and I would not disregard it for anything." And Allah, the Blessed and Exalted, says, {We do not abrogate any verse or cause it to be forgotten except that we bring forth one better than it or similar to it} (Surah al-Baqarah 2:106).

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Reference: Musnad Ahmad Ibn Hanbal Book 5

Hadith No: 3
Ahmad ibn Hanbal - Musnad al-Imam Ahmad ibn Hanbal
Musnad al-Ansar (ra) - Hadith of Abu al-Munthir Ubayy ibn Ka'b (ra)
Volume: (5) - Page Number: (113)
20582 - Yahya ibn Sa'id narrated to us, from Sufyan, who said: Habib, meaning Ibn Abi Thabit, narrated to me from Sa'id ibn Jubair from Ibn Abbas (ra) who said: Umar said, "Ali is our best in judgment, and Abi is our best in recitation. And we are leaving off something from Abi’s words, while Abi says, 'I took [it] from the mouth of the Messenger of Allah (peace be upon him and his holy progeny), so I will not leave it.' Allah (mighty and majestic be He) says, {We do not abrogate any verse or cause it to be forgotten, except that we bring forth a better one or one like it} (Surah al-Baqarah 2:106).

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Reference: Musnad Ahmad Ibn Hanbal Book 5

Hadith No: 4
Ahmad ibn Hanbal - Musnad al-Imam Ahmad ibn Hanbal
Musnad al-Ansar (ra) - Hadith of Abu al-Munthir Ubayy ibn Ka'b (ra)
Volume: (5) - Page Number: (113)
20583 - Abdullah narrated to us, saying: Suwayd ibn Sa'id narrated to me in the year 226 AH, saying: Ali ibn Musar narrated to us, from al-A'mash, from Habib ibn Abi Thabit, from Sa'id ibn Jubayr from Ibn Abbas, who said: Umar (ra) addressed us on the pulpit of the Messenger of Allah (peace be upon him and his holy progeny) and said: "Ali (ra) is our best judge, and my father (ra) is our best reciter. And we do leave some of Abu's words, even though my father heard things from the Messenger of Allah (peace be upon him and his holy progeny)." And Ubayy (ra) would say, "I will not abandon what I heard from the Messenger of Allah (peace be upon him and his holy progeny)," and a Book was revealed after Abu.

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Reference: Musnad Ahmad Ibn Hanbal Book 5

Hadith No: 5
Ahmad ibn Hanbal - Fada'il al-Sahabah - And from the virtues of Ali (peace be upon him)
And among the virtues of Ali (may Allah be pleased with him) from the narration of Abu Bakr ibn Malik from his teachers, excluding Abdullah
Volume: (2) - Page Number: (654)
1113 - Abdullah ibn al-Hasan narrated to us, who said: Malik ibn Sulayman, Abu Anas al-Ansari, narrated to us, saying: Isma'il ibn Iyash narrated to us, saying: Safwan ibn Amr narrated to us from Humayd ibn Abdullah ibn Yazid al-Madani, that he mentioned a ruling made by Ali ibn Abi Talib in the presence of the Prophet (peace be upon him and his holy progeny), and the Prophet (peace be upon him and his holy progeny) was pleased. He said: "All praise is due to Allah who has placed wisdom among us, the Ahl al-Bayt."

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Reference: Fazael al-Sahabah Book 2