Abstract
Islam is a divine religion and a complete system for life which has always shown the right way to humanity. The legal system of Islam has solved major problems of humanity. Islam is a universal moderate religion that could be applied in every age and nation. Today the world needs a legal system where it is possible to have security and peace. This can largely be achieved under the legal system of Islam. In Islamic legal system, psychological and natural traits of entire humanity is considered. For that reason, in Islamic legal system, some important juridical issues were given due consideration. For example, no law should be enacted which is unbearable by the masses; Individual and collective liberty were given due recognition in Islamic legal code. Likewise, there is a well-known principle from a Ḥadīth: “Do not be harmed or harm others in Islam”. This article is divided into following: First: Citation of the different expressions of this maxim and its importance, Second: Literal and Religious definition of the principle with the difference between “being harmed” and “harming” Third: A detailed explanation of the principle with examples Fourth: Proofs for the principle and the reasons for choosing them Fifth: Principles that strengthen or explain this principle: explanation and link with the principle “Do not be harmed or harm others”.