Most of contracts in Fiqh are set based on a certain reason. Furthermore, all contracts need some certain general reasons according to which conditions and regulations of contracts are derived. In four parts, the essay discusses the verse mentioning "merchandising by mutual consent".First, terminology and etymology of the verse are discussed. Then, the concepts are mentioned and whether the verse proves the liability in case a contract is invalid is examined. Third, effective scope of the verse is systematically reviewed and independency of this verse in deducing contract regulations or inconsistency of utilizing this verse and similar verses for deduction is discussed. Finally, the authorexemplifies the case with some current contracts such as setting a price for cancellation of a contract, commission fee of non-benefit loans, violation of work hour by employees, etc.