Abdur Rahman bin Yazid says that once we went to Hazrat Hudhaifa (may Allah be pleased with him) and said to him, "Tell us about a person who is the closest to the Prophet Muhammad (peace be upon him) in manners and character, so that we may learn these ways from him and listen to hadith from him." He replied, "In character and manners, the one who most resembled the Prophet Muhammad (peace be upon him) was Ibn Mas'ud."