The principle of Nafye Sabilwhich is sometimes referred to as «العلو», «الاستعلاء» and «الإسلام یعلوولا یعلى علیه» is one of the important Islamic principles that is documented by Qur’an verses, Al-Akhbar Al-Mustafiz and Ijma (Consensus). In many cases jurists have taken this law as the basis of inferring subordinate rules. According to the  provisions of this principle, any action which paves the way for the enemies of religion or non-Muslims to have guardianship and domination over a Muslim or Muslims is forbidden by Islam (Hara’m). It has been said, “The goal of the principle of Nafye Sabil, is real domination over the primary case which means according to this principle, any contract, treaty, compact and agreement, leading to loftiness, honor and dignity of the faithless over Muslims, based on its initial nature, is negated and it has no legal credit.” The subject of present study is the principle of Nafye Sabil. The author in this article discusses the concept and provisions of the principle of Nafye Sabil, its religious position, and documents, and finally analyzes some subordinate religious rules based on this principle. Adequately arguing about the evidence of this principle, the author believes that the only reliable evidence of this principle is the reason, and that it is absolutely necessary to consider the reason while documenting this principle.