The efficacies of hadith in Islamic ethics is concerned with the authenticity and inauthenticity of ethical hadiths. The authenticity of ethical ahadith is deeply connected to the problem of tolerance in the proofs of sunan which has led to the two views of tolerance and intolerance. In this paper, it has been argued that ethics and jurisprudence are two distinct fields and one can not agree with applying the proofs of sunan with its jurisprudental essence in ethics. Furthermore, in order to prevent disorders and damages in concerned knowledge, one should be sure about the authenticity of ethical hadiths. In this way, the hadiths of intolerance may be of considerable applications in ethics; they can be used for explaining ethical concepts and values, diciding the goal of ethics and proposing good state of deed and agent in isolation.