There is no doubt that defining the sources of civil law is of great importance, not only for defining the legal rules that can be applied to the facts of the species, their arrangement, and indicating their priority, but rather for understanding the legal rules and their interpretation and removing the ambiguity that surrounds them. It is the established cause according to the requirements of the principle of causation. Most of the jurisprudence gives the source multiple meanings, the most important of which are two meanings: Official sources, which are the authority that gives legal rules their binding force. Legislation is an official source within the limits of its competence, i. Except when there is no text in the legislation