Mustadrak al-Hakim — Hadith 4678

It is narrated from Abu Thabit, the freed slave of Sayyiduna Abu Dharr (may Allah be pleased with him), that: I was with Sayyiduna Ali (may Allah be pleased with him) on the day of the Battle of the Camel. When I saw Sayyidah Aishah (may Allah be pleased with her) standing (on the opposing side), the same misgiving arose in my heart that was arising in the hearts of the people in general. Then, at the time of the Zuhr prayer, Allah removed that doubt from me, and I fought alongside the Commander of the Believers. When the battle was over, I went to Madinah, presented myself before the Mother of the Believers, Sayyidah Umm Salamah (may Allah be pleased with her), and said: By Allah, I have not come to ask for food or drink; rather, I am the freed slave of Abu Dharr. She said: Welcome. Then I told her my whole story, and she asked: Where were you when people's hearts were flying away? I said: I was where Allah removed that doubt from me at the time the sun passed its zenith. She said: You did very well. I heard the Messenger of Allah (peace and blessings be upon him) say: "Ali is with the Qur'an and the Qur'an is with Ali; the two will never separate from each other until they come to me at the Pond of Kawthar."
This hadith has a sahih (authentic) chain of narration, and Abu Sa'id al-Taymi is trustworthy and reliable, but the two Shaykhs (Bukhari and Muslim) did not record it.