Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 211

وَعَن حذيفةَ قَالَ: إِنَّ أَشْبَهَ النَّاسِ دَلًّا وَسَمْتًا وَهَدْيًا بِرَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَابْنُ أم عبدٍ مِنْ حِينِ يَخْرُجُ مِنْ بَيْتِهِ إِلَى أَنْ يرجع إِلَيْهِ لَا تَدْرِي مَا يصنع أَهله إِذا خلا. رَوَاهُ البُخَارِيّ

Hudhaifa said: The one who most closely resembled God’s messenger in deportment, manner of life and conduct was Ibn Umm `Abd[*] from the time he came out of his house till he returned to it, but we did not know how he treated his family when he was alone with them. *i.e., Abdallah b. Masud. Bukhari transmitted it.