One of the issues that can be investigated in law is the issue of the necessity of fulfilling obligations. At first, the author defined the obligation from a literal point of view and then from a semantic point of view, and although there is no definition of the obligation in Iranian law and only the examples and works resulting from it are mentioned, Islamic jurists and Shia jurists have expressed the obligation as follows: "Obligation It is a legal relationship by which the obligee can oblige the obligee to pay money or goods, or perform a certain act or omission, or destroy a legal work. Then the author mentions the elements, types and causes of obligation and that the causes of obligation are not clearly defined in the civil law and most authors consider the obligation to be caused by five factors, imitating Napoleon's law. In the end, he has mentioned some things about the juridical and legal foundations of the necessity of fulfilling the obligation.
Machine summary:
"The writer first defined the obligation from a literal point of view and then from a semantic point of view, and although there is no definition of the obligation in Iranian law and only the examples and effects resulting from it are mentioned, Islamic jurists and Shiite jurists have expressed the obligation as follows: Obligation is a legal relationship by which the obligee can oblige the obligee to pay money or goods, or to perform or refrain from a specific act, or to destroy a legal work." Thus, the issue of general ownership, which is comprehensive, is between unstable and stable. It is destroyed and the ownership remains in the same way as it was created, and in case of doubts about the permissibility and necessity, that means whether the holy law of the ruling refers to the permissibility.or due to the inadmissibility of recourse, which will forcefully justify the recourse of the first owner, the acquisition of the remaining property of the second owner is current; Because the pillars of Istihab, the most important of which is the unity of two definite and doubtful propositions, are fixed. Another point regarding the doubt regarding the necessity in the suspensory acquisition contracts is whether ownership of the property is valid in these contracts to fulfill the necessity?Sheikh Ansari Qudssera believes in the non-existence of ownership of property, stating that possession in these contracts is suspended on a non-existent matter, such as the contract of fraud and subjugation, and in case of non-performance of the action on which the fraud is placed, if there is doubt about its necessity So, Istihab does not have an executor's property, because before the acquisition, there is no fixed property in order for Istihab to survive."