Following and obeying the Ahl al-Bayt of the Prophet (as)

Hazrat Fatima Zahra (SA) said: 

امّا وَاللّهِ، لَوْتَرَكُوا الْحَقَّ عَلى اهْلِهِ وَاتَّبَعُوا عِتْرَةَ نَبیّه، لَمّا اخْتَلَفَ فِى اللّهِ اثْنانِ وَ لَوَرِثَها سَلَفٌ عَنْ سَلَفٍ وَخَلْفٌ بَعْدَ خَلَفٍ حَتّى یَقُومَ قائِمُنا، التّاسِعُ مِنْ وُلْدِ الْحُسَیْنِ عَلَیْه السَّلام.

I swear in the name of Allah, if they would hand over the right, that is, the caliphate and the Imamate, to those who are responsible and worthy of this (right); and if they had followed and obeyed the Itrah and Ahlul-Bayt of the Prophet(as), then without a doubt it would not have happened even two people to disagree with each other about Allah and Religion.

(Al-Imamah wat-Tabsirat: P. 1. Bihar al-Anwar: v 36, p. 352, H. 224).