lacks understanding, and many a bearer of understanding conveys it to someone who understands it better than he does.
Three things keep a believer’s heart free of corruption: dedicating one’s deeds sincerely to Allah, offering sincere counsel to those in authority, and remaining with the Muslim community.” (1)
Al-Hākim narrated these hadiths in al-Mustadrak and stated that they met the criteria for authenticity.
This implies that the Muslim community can agree only upon truth, guidance, and what is right, and that those most entitled to this distinction are the Companions of the Messenger of Allah—may Allah bless him and grant him peace. It follows that their establishment of al-Siddīq’s caliphate was true, rightly guided, and correct.
Moreover, the early generations strongly condemned anyone who opposed consensus, counting him among those given to deviation and misguidance. Had this been commonplace among them, they would not have condemned it. Their condemnation rested on certainty, and they did not permit anyone to refrain from condemning such a person. This indicates that, for them, consensus was established with certainty.