Inference by custom in the chapters of sale, usury and loan from the book of the box

The science of origins is a great science, a great benefit, which the jurist and the agreed upon, and the speaker and the interpreter do not dispense with those with the eyes, and does not deny the virtues of the people of the impact, which is the correct constitution of deduction and diligence, through which he can set up hearing evidence on its implications and know how to derive legal rulings from them. It is one of the most beneficial sciences, and the most honorable of it is a place, and it is one of the most important means that have proven and supported the rules of religion. As we know, the sources of Islam are the Holy Qur’an, the Sunnah of the Prophet, consensus and measurement. This is all of the scholars have agreed to prove it, and there are some sources in which the scholars differed, including: the interest sent and the approval and began by us, custom and others. The scholars have resolved the problems that occurred in the midst of society, derived the rulings that are appropriate to their conditions derived from the book and the Sunnah, and the incidents that we did not find an analysis occurred from the book and the Sunnah, or as it is called emerging matters, especially in this era. In such a case, scientists make their effort to derive the rulings from the book and the Sunnah, and there is no doubt that some customs, circumstances and traditions in that time and place may be commensurate with the law or not commensurate with them. This humble research comes in destiny and how much; To come out to us some of the scholars of the inference of custom in specific chapters of jurisprudence. This research was named after: (Inference by custom in the sections of selling, usury and loan from the book of the box of the square).