It was narrated from Abu Hurairah that:
The Messenger of Allah said: "Every Prophet will have a friend in Paradise, and my friend there will be 'Uthman bin 'Affan." (JA)
English reference (JA): Vol. 1, Book 1, Hadith 109 (JA)
Arabic reference (JA): Book 1, Hadith 114 (JA)