The purpose of reaching the explanation of the core of the origins of Imam Zakaria Al -Ansari Al -Shafi'i is a book on the principles of jurisprudence, in which he explained the body of "the core of the origins" for him as well, and the core of the origins is a brief book "Collecting Mosque in the Fundamentals of Jurisprudence" by Imam Taj Al -Din Al -Sobky. Sheikh Al -Islam Zakaria Al -Ansari says in the introduction to the book: "This is an explanation of the two conclusions called the pulp of the origins in which I summarized the collection of mosques, showing his facts, clarifying his minutes, and humiliating the word difficulty, and reveals the face of the meanings of his union, in which it is often the phrase of our Sheikh, the scholar Al -Fahmah, Jalal al -Din, the local ; For her smoothness and good composition, and a rum for the blessing of her author, and his name is "the purpose of reaching the explanation of thecore of the origins", and God asks to benefit from it while he is my beloved and yes, the agent.