In the verse 55 of Noor, believers have been that they will substitute all over the worlds, establish Divine religion and change their fear to peace. The believers will found a monotheist society free from every kind of polytheism. Shiite commentators are of two views in this field: one limits this promise to the age of appearance, zohoor and end of history and the other has known the promise as including all cases of such establishment from beginning of revelation to the age of zohoor. Shiite commentators partial difference of view would disappear if the meaning of istikhlaf, substitution, become clear. By such a consideration, one may know the case as limited to the age of zohoor. And Sunni commentators, in spite of their difference of views, also may be known to be of such an idea though not in one level but differently.