Hadith No: 1
Al-Nasa'i - al-Sunan al-Kubra - Book of Distinctions
Mentioning the Prophet's (peace be upon him and his holy progeny) statement: "Ali will fight on the interpretation of the Quran just as I fought on its revelation."
Volume: (7) - Page Number: (466)
8488 - Ishaq ibn Ibrahim and Muhammad ibn Qudamah narrated to us, and the wording is from him, from Jarir, from al-A'mash, from Isma'il ibn Raja', from his father, from Abu Sa'id al-Khudri, who said: We were sitting, waiting for the Messenger of Allah (peace be upon him and his holy progeny), when he came out to us, and one of the straps of his sandal had broken. He threw it to Ali and said: "Indeed, among you is one who will fight on the interpretation of the Quran just as I fought on its revelation." Abu Bakr said, "Is it me?" He replied, "No." Umar said, "Is it me?" He replied, "No, but it is the one with the sandal."

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Reference: Al-Sunan al-Kubra Book 7

Hadith No: 2
Ibn Hibban - Sahih Ibn Hibban - Book of His (peace be upon him) Reports on the Virtues of the Companions, Their Men
Mentioning the Battle of Ali ibn Abi Talib (may he be pleased with him) on Interpretation
Volume: (15) - Page Number: (385)
6937 - Ahmad ibn Ali ibn al-Mundhiri narrated to us, saying: Uthman ibn Abi Shaybah narrated to us, saying: Jarir narrated to us, from al-A'mash, from Isma'il ibn Rija', from his father from Abu Sa'id al-Khudri, who said: I heard the Messenger of Allah (peace be upon him and his holy progeny) say: "Indeed, among you is one who will fight for the interpretation of the Quran just as I fought for its revelation." Abu Bakr said: "I am he, O Messenger of Allah!" He said: "No." Umar said: "I am he, O Messenger of Allah!" He said: "No, but the one repairing the sandal." He had given Ali his sandal to repair.

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Reference: Saheeh Ibn Hibbaan Book 15