This study aims to highlight the cognitive superiority of Islamic legislation in establishing many legal principles and theories, and to demonstrate the distinctive features of Islamic legislation compared to positive laws, reaching a level of perfection. The study also presented examples of jurisprudential theories that contributed to enriching many legal principles and theories, such as: the theory of abuse of right, the theory of emergency circumstances, the theory of liability for shortcomings, and the responsibility of non-discrimination. Furthermore, the research showed the extent of the influence of Islamic jurisprudence on both modern and ancient Western laws, as well as Arab legal codes.