Sahih al-Bukhari 3713
Book 62: Companions of the Prophet
Arabic
أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ عَبْدِ الْوَهَّابِ، حَدَّثَنَا خَالِدٌ، حَدَّثَنَا شُعْبَةُ، عَنْ وَاقِدٍ، قَالَ سَمِعْتُ أَبِي يُحَدِّثُ، عَنِ ابْنِ عُمَرَ، عَنْ أَبِي بَكْرٍ ـ رضى الله عنهم ـ قَالَ ارْقُبُوا مُحَمَّدًا صلى الله عليه وسلم فِي أَهْلِ بَيْتِهِ.
English translation
Abu Bakr said: Look at Muhammad through his family (i.e. if you are no good to his family you are not good to him)
Reference: Sahih al-Bukhari 3713, Book of Companions of the Prophet. English translation by Dr. Muhammad Muhsin Khan.