alteration

Tahrif (Arabic: "corruption, forgery"; the stem-II verbal noun of the consonantal root , "to make oblique") is an Arabic term used by Muslims with regard to words, and more specifically with regard to what Jews and Christians are supposed to have done to their respective Scriptures. Most Muslims believe that Jews and Christians have deliberately changed the text of the Hebrew Bible and New Testament, through altering words from their proper meaning, changing words in form, or substituting words or letters for others. This is considered by Islam to be a deliberate change which distorted the word of God, and which thus necessitated the giving of the Quran to Mohammed, to correct this perceived distortion.