Hudhayfah (may Allah be pleased with him) said: "I have not seen any man who resembles the Messenger of Allah (peace and blessings be upon him) in bearing, dignity and conduct, from the time he leaves his house until he returns to it, as closely as this man," meaning Abdullah bin Mas'ud (may Allah be pleased with him), "and the fortunate ones among the Companions of Muhammad (peace and blessings be upon him) know that he is among those of them nearest to Allah on the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8452