Sahih al-Bukhari 3713
Sahih al-Bukhari · Book 62: Companions of the Prophet · The virtues of the relatives of Allah’s Messenger ﷺ
Abu Bakr:
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.
Look at Muhammad through his family (i.e. if you are no good to his family you are not good to him).