Umm Ala reported,

Uthman bin Mazun was assigned to lodge with us when the Ansar drew lots over the housing of the Muhajirun. He fell ill, and we nursed him until he died. We then wrapped him in his shrouds, and the Messenger of Allah ﷺ came in to us.I said, "May Allah have mercy on you, Abu Saaib. My testimony about you is that Allah has honored you."The Messenger of Allah ﷺ said, "And how do you know that?"I said, "I do not know, by Allah."He said, "As for him, certainty has come to him, and I do hope for him goodness from Allah. But by Allah, even though I am the Messenger of Allah, I do not know what will be done with me or with you."Umm Ala said, "By Allah, I will never declare anyone pure after him."She said, "I saw in a dream a flowing spring belonging to Uthman, so I came to the Messenger of Allah ﷺ and mentioned that to him."He said, "That is his deeds flowing on for him."

Bukhari 7018

Sahih

حدثنا عبدان أخبرنا عبد الله أخبرنا معمر عن الزهري عن خارجة بن زيد بن ثابت

عن أم العلاء وهي امرأة من نسائهم بايعت رسول الله ﷺ قالت

طار لنا عثمان بن مظعون في السكنى حين اقترعت الأنصار على سكنى المهاجرين فاشتكى فمرضناه حتى توفي ثم جعلناه في أثوابه فدخل علينا رسول الله ﷺ فقلت رحمة الله عليك أبا السائب فشهادتي عليك لقد أكرمك الله قال وما يدريك قلت لا أدري والله قال أما هو فقد جاءه اليقين إني لأرجو له الخير من الله والله ما أدري وأنا رسول الله ما يفعل بي ولا بكم قالت أم العلاء فوالله لا أزكي أحدا بعده قالت ورأيت لعثمان في النوم عينا تجري فجئت رسول الله ﷺ فذكرت ذلك له فقال ذاك عمله يجري له

البخاري 7018صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Dream interpretation
Chapter
Flowing spring in a dream
Numbering
Darussalam 7018
Bukhari 7018