We asked Hudhaifa to tell us of a person resembling (to some extent) the Prophet (ﷺ) 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.
Sahih al-Bukhari Book 62, Hadith 107
← Previous Hadith I went to Sham and was offering a two-rak`at prayer; I said, "O Allah! Bless me with a (pious) companion." Then I saw an old man coming towards me, and when he came near I said, (to myself), "I hope Allah has given me my request." The man asked (me), "Where are you from?" I replied, "I am from the people of Kufa." He said, "Weren't there amongst you the Carrier of the (Prophet's) shoes, Siwak and the ablution water container? Weren't there amongst you the man who was given Allah's Refuge from the Satan? And weren't there amongst you the man who used to keep the (Prophet's) secrets which nobody else knew? How did Ibn Um `Abd (i.e. `Abdullah bin Mas`ud) use to recite Surat-al-lail (the Night:92)?" I recited:-- "By the Night as it envelops By the Day as it appears in brightness. And by male and female." (92.1- 3) On that, Abu Darda said, "By Allah, the Prophet (ﷺ) made me read the Verse in this way after listening to him, but these people (of Sham) tried their best to let me say something different."

Sahih al-Bukhari Book 62, Hadith 106 Next Hadith → My brother and I came from Yemen, and for some time we continued to consider `Abdullah bin Mas`ud as one of the members of the family of the Prophet (ﷺ) because we used to see him and his mother going in the house of the Prophet (ﷺ) very often.

Sahih al-Bukhari Book 62, Hadith 108