This issue has been raised since the time of Malik and Ahmad Hanbal. And they have insisted on it to prove the sanctity or obligation of many issues and have accepted it as the principle of jurisprudence. Abu Hanifah and Shafi'i have insisted on it in some places. At a first glance, the source barrier is different from the haram introduction, because usually the Sunnis, due to the lack of a text, have relied on analogy and praise and the like, which is the same way as the source barrier. Unlike the Imamiyyah, they did not face this problem.
Reference was made to Shia and Sunni sources, including the principles of comparative jurisprudence of Hakim (may Allah be pleased with him), the principles of jurisprudence and the encyclopedia of comparative jurisprudence. The article is presented in two sections, the sources of the sources and the introduction of the forbidden.
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