Mustadrak al-Hakim — Hadith 3738

It is narrated from Sayyidah Umm al-Ala' al-Ansariyyah (may Allah be pleased with her), who had given the pledge of allegiance to the Messenger of Allah (peace and blessings be upon him), that she said: When the Ansar drew lots for housing the Muhajirun, the lot of Sayyiduna Uthman bin Maz'un (may Allah be pleased with him) fell to stay with us. Then he fell ill, and we nursed him until he passed away, and we wrapped him in his shroud. She said: Then the Messenger of Allah (peace and blessings be upon him) came in, and I said (addressing the deceased): "O Abu al-Sa'ib, may the mercy of Allah be upon you; my testimony is that Allah has certainly honoured you." On hearing this the Prophet (peace and blessings be upon him) said: "How do you know that?" I said: "By Allah, O Messenger of Allah, I do not know." He (peace and blessings be upon him) said: "As for him, certainty (death) has come to him, and I hope for good for him from Allah." Then the Messenger of Allah (peace and blessings be upon him) recited this verse: "Say: I am not something new among the messengers, and I do not know what will be done with me or with you" [Surah al-Ahqaf: 9]. Umm al-Ala' said: "By Allah, I will never again declare anyone (definitively) pure after him." Umm al-Ala' said: I saw in a dream a flowing spring belonging to Uthman (may Allah be pleased with him), so I came to the Messenger of Allah (peace and blessings be upon him) and mentioned it to him, and he (peace and blessings be upon him) said: "That is his deed, which continues to flow for him."
The two Shaykhs differed over recording this hadith: Imam Bukhari narrated it from Abdan in abridged form, while Imam Muslim did not record it.