My brother and I came from the Yemen and for quite a time we had no idea that `Abdallah b. Mas'ud was other than a member of the Prophet's family because of seeing how frequently he and his mother went in to visit the Prophet. (Bukhari and Muslim.)
Reported by Al-Bukhari (No. 3763) and At-Tirmidhi (No. 3806). Cited in Mishkat al-Masabih (No. 6198).
أَنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ رَجُلٌ مِنْ أَهْلِ بَيْتِ النَّبِيِّ صلى الله عليه وسلم، لِمَا نَرَى مِنْ دُخُولِهِ وَدُخُولِ أُمِّهِ عَلَى النَّبِيِّ صلى الله عليه وسلم.