Sahih Bukhari Volume 9, Book 87, Hadith Number 132.

Narrated By Az-Zuhri : Regarding the above narration, The Prophet said, “I do not know what Allah will do to him (Uthman bin Maz’un).” Um Al-‘Ala said, “I felt very sorry for that, and then I slept and saw in a dream a flowing spring for ‘Uthman bin Maz’un, and told Allah’s Apostle of that, and he said, “That flowing spring symbolizes his good deeds.”