In some verses of holy Quran including 75 of Baqara, 46 of Nisaa and 13 and 41 of Maida the word distortion, tahrif, has been mentioned clearly. This Quranic term being used with regard to the people of the book, has been linked to the changing of the Testaments. The verses in the field have not described the changing in detail, considering the traditions, however, one may understand a kind of development in the meaning of the distortion. A deep study on the distortion would lead to an understanding of the criteria for it including the state of being beyond writing and concentering on a special case.