Kharijah bin Zayd bin Thabit al-Ansari (may Allah have mercy on him) narrates that Sayyidah Umm al-Ala (may Allah be pleased with her), a woman of the Ansar who had given the pledge of allegiance to the Messenger of Allah (peace and blessings be upon him), informed him that the Ansar divided the Muhajirun among themselves by drawing lots, and Sayyiduna Uthman bin Maz'un (may Allah be pleased with him) fell to our share. We lodged him in our house, and then he was afflicted with the illness in which he died. When he died, was washed and shrouded in three garments, the Messenger of Allah (peace and blessings be upon him) came in. I said: O Abu al-Sa'ib! May the mercy of Allah be upon you; I bear witness that Allah Almighty has honoured you. The Messenger of Allah (peace and blessings be upon him) said: "How do you know that Allah has honoured him?" (I said:) May my father and mother be ransomed for you! Then whom will Allah Almighty honour? The Messenger of Allah (peace and blessings be upon him) said: "As for him, certainty (death) has come to him. By Allah! I too hope for good for him. Yet, by Allah! I do not know, even though I am the Messenger of Allah, what Allah Almighty will do with me." She said: I said: By Allah! I will never again declare anyone pure.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6711