Proofs of the validity of consensus in matters of faith from the point of view of theologians

Consensus is one of the sources of reaching rulings, which may be a source of beliefs as well. In the theological books of Islamic scholars, Shia or Sunni, the reason for consensus has been used to prove some of the doctrines. And what is the criterion of credibility and the scope of its validity? This research aims to examine the answers to the above questions from the most important theological schools, namely the Imamiyyah, Mu'tazilah, Ash'ari, and Matridiyyah. This research, which is of a fundamental type, has tried to explain the different dimensions of consensus with the analytical and library methods and with the approach of rational and narrative reasoning. In this article, the reasons given for the validity of consensus in matters of belief have been undermined. The most important results obtained in this research are that: the fundamentalists of the Imamiyyah and some Akhbaris accept the authority of consensus based on reason, the Ash'arites accept the authority of consensus through narration, and most of the Mu'tazila and Matridiyya also accept the authenticity of consensus through narration. In this article, there is a flaw in the arguments presented, and Mukhtar's opinion is that: there is no evidence for the validity of consensus in matters of faith.