Those prophets of independent revealed book and Divine religion are known as ululazm prophets. The prophets Noah, Abraham, Moses, Jesus and Mohammad (a) are called ulul-azm. Orientalists have studied Noah, Abraham and Moses in the holy Quran. This paper studies their views critically. Though the subject of the paper has been centered on, in this paper, the views of Muslim scholars are brought into consideration. As shown in the paper, orientalists have studied the subject in detail; yet, their mistakes in the field show that they have not referred to all pertaining sources. Their reliance on some weak traditions has led them to the view of the prophets` not being pure.