The forensic evidence important for the sources of legislation after the book of God Almighty and the Sunnah of the purified, including what is agreed upon in the protest, which is the book and the Sunnah and consensus, and what is different in the protest, such as measurement and approval and say companions and interests sent, and that the approval of the evidence that did not agree Accordingly, the terms of the fundamentalists differed and their definition differed with the similarity between each other, and the approval in some schools is an argument is not considered as the Shaafa'is, so it may correspond to measurement with them, but the approval at the tap and those who agree is a hidden measurement is likely to clear measurement,I have defined the approbation and the statement of the argument and evidence based on it, and also showed the types of approbation and its relationship to measurement, has more Imam Abu Hanifa - may God have mercy on him - than the approval in many issues of jurisprudence and followed in his students in their classifications, including Imam Muhammad bin Hassan al-Shaibani-God's mercy - In his simplified book, or what is known as the original, I studied some of the issues contained in his book, which meet the conditions of approval of different sections, and I studied a fundamentalist study compared to the rest of the doctrines, so I transferred the matter from the book of the simplified to Imam Muhammad ibn al-Hassan and then convey the sayings of other doctrines In this matter if Moi Jurisprudence or otherwise, and then I mention the summary of the matter, and I hope that I have succeeded in this work every work is wrong and right