Sahih al-Bukhari 4384
Sahih al-Bukhari · Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · The arrival of Al-Ash’ariyun and the people of Yemen
Narrated Abu Musa:
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ ، وَإِسْحَاقُ بْنُ نَصْرٍ ، قَالاَ حَدَّثَنَا يَحْيَى بْنُ آدَمَ ، حَدَّثَنَا ابْنُ أَبِي زَائِدَةَ ، عَنْ أَبِيهِ ، عَنْ أَبِي إِسْحَاقَ ، عَنِ الأَسْوَدِ بْنِ يَزِيدَ ، عَنْ أَبِي مُوسَى ـ رضى الله عنه ـ قَالَ قَدِمْتُ أَنَا وَأَخِي، مِنَ الْيَمَنِ، فَمَكَثْنَا حِينًا مَا نُرَى ابْنَ مَسْعُودٍ وَأُمَّهُ إِلاَّ مِنْ أَهْلِ الْبَيْتِ، مِنْ كَثْرَةِ دُخُولِهِمْ وَلُزُومِهِمْ لَهُ.
My brother and I came from Yemen (to Medina) and remained for some time, thinking that Ibn Masud and his mother belonged to the family of the Prophet (ﷺ) because of their frequent entrance (upon the Prophet) and their being attached to him.