Sahih Bukhari
Companions of the Prophet
Volume: 005 / Book Number: 057 / Hadith Number: 106
Narrated 'Abdur-Rahman bin Yazid:
We asked Hudhaifa to tell us of a person resembling (to some extent) the Prophet in good appearance and straight forward behavior so that we may learn from him (good manners and acceptable conduct). Hudhaifa replied, "I do not know anybody resembling the Prophet (to some extent) in appearance and conduct more than Ibn Um 'Abd.