Promotion of good and prevention of evil is the most important command of the legislator in the area of public supervision among Muslims. From the early Islam up to the present time these two essential religious obligations have played a crucial role in dynamism and mobility of Islamic society towards ideals. One of the research requirements in the area of promotion of good and prevention of evil is to study these two religious obligations with regard to other overlapping topics like inviting to the goods, avoiding the ignorant, and so forth. The present article, using a descriptive-analytical method, focuses on the verse 199 of the Sura Al-A'raf “wa a'raza 'an al-jahilin”. Meanwhile, it studies the applicability or inapplicability of the concept of promotion of good and prevention of evil in relation to the Quranic interpretation of avoiding the ignorants based on the view of the exegetes and jurists. Considering the two different approaches of analyzing the promotion of good and prevention of evil, the research findings show two different results: If legislator has a vocative taste in the promotion of good and prevention of evil, because avoiding the ignorants is not vocative, it does not mean it, but if these two obligations are canonical, considering the fact that the criterion of the legislator for making them obligatory is to establish the good and eliminate the evil, the criterion also exist in avoiding the ignorants and will be relevant to these two obligations