It was Ibn Khazem (1064) who was the first Muhammadan to charge that the Bible has been corrupted and falsified by the followers of Moses and Jesus.
This charge was made in a last ditch and desperate effort to defend'Islam' against Christianity because he came upon the many serious and unexplainable contradictions and differences between the Quran and the Bible.
Believing by faith that the Quran is true and incorruptible, Ibn Khazem had no choice but to come to the conclusion that then it must be the CURRENTBible that is false and untrue especially since Muhammad instructed his followers to respect the Bible in the first place.
Therefore, the present text must have been falsified by the Christians and the Jews after the time of Muhammad. His conclusions and arguments are not based on any historical facts but entirely upon his unshakable faith in the truthfulness and divine origin of the Quran.
Many other exegetes, did not accept or agree with his conclusions among whom are many of the luminaries of 'Islam' such as:
1. Ali al Tabari (d 855) who accepted the Gospel texts
2. Al Bukhari (810-870)
3. Al Mas'udi (956)
4. Abu Ali husain bin Sina (1037)
5. Al Ghazali (1111) who did not accept his teachings
6. Ibn Khaldun (1406) ditto.
In reality it is not up to the People of the Book to prove their Book is uncorrupted but up to the Muhammadans to do so based on any 'original' book that would show these corruptions.
The interpreters of the Quran repeatedly denigrate and accuse both the Jews and Christians of having tampered with and or 'corrupted' their Holy Books to suit their - with as yet unexplained and unidentified - nefarious purposes.
These evil, mendacious and unsubstantiated accusations were in fact introduced to cover up the incredibly huge number of unexplainable and irreconcilable differences in both the Quran and its interpretations with the same events as discribed in their original versions in the Bible and Scriptures.
Hence, with an extremely simple and general sentence they, the followers of Muhammad, attempt to dismiss and gloss over all these discrepancies as items that have been deliberately - and presumably with diabolical pre meditation- modified by the Jews and Christians to deprive Muhammad and his followers of their 'rightful' place among the Divinely revealed scriptures.
Unfortunately for the Muhammadan accusers, it can be easily demonstrated that in all its relevant verses, the Quran declares the Bible to be a true revelation of Allah and demands faith in it such as can be shown in the following Suras which presuppose the availability of the true revelation of Allah to the Arabs at the time of Muhammad:
2:136 Say ye: "We believe in Allah and the revelation given to us and to Abraham Isma'il Isaac Jacob and the Tribes and that given to Moses and Jesus and that given to (all) Prophets from their Lord we make no difference between one and another of them and we bow to Allah (in Islam)."
*** In this verse the Quran makes no distinction between Allah's revelations; that is they are ALL true and uncorrupted ***
2: 285 The Apostle believeth in what hath been revealed to him from his Lord as do the men of faith. Each one (of them) believeth in Allah His angels His books and His Apostles "We make no distinction (they say) between one and another of His Apostles." And they say: "We hear and we obey; (We seek) Thy forgiveness Our Lord and to Thee is the end of all journeys."
3: 3It is He Who sent down to thee (step by step) in truth the Book confirming what went before it; and He sent down Law (Of Moses) and the Gospel (of Jesus) before this as a guide to mankind and He sent down the Criterion (of judgment between right and wrong).
3: 71Ye People of the Book! Why do ye clothe truth with falsehood and conceal the truth while ye have knowledge?
*** No where does the Quran even IMPLY that the People of the Book had CORRUPTED the TEXTS of their Scriptures but only that some of them MISREPRESENTED the MEANING of SOME Texts ***
3: 93All food was lawful to the children of Israel except what Israel made unlawful for itself before the Law (of Moses) was revealed. Say: "Bring ye the Law and study it if ye be men of truth."
*** In the particular case above, the Quran implies that the Children of Israel'corrupted' some of Allah's commands BEFORE the revelations to Moses and NOT AFTER ***
4: 47O ye people of the Book! believe in what We have (now) revealed confirming what was (already) with you before We change the face and fame of some (of you) beyond all recognition and turn them hindwards or curse them as We cursed the Sabbath-breakers: for the decision of Allah must be carried out.
*** If, as al Khazem and other followers of Muhammad insist that the People of the Book have corrupted their Books, they could have done this only AFTERMuhammad'sQuran and not BEFORE since this verse CLEARLY shows, that the Quran is CONFIRMING these same previous revelations and would not have done so if they had already been corrupted ***
5:44It was We who revealed the law (to Moses); therein was guidance and light. By its standard have been judged the Jews by the Prophet who bowed (as in Islam) to Allah's will by the Rabbis and the doctors of Law: for to them was entrusted the protection of Allah's Book and they were witnesses thereto: therefore fear not men but fear Me and sell not My Signs for a miserable price. If any do fail to judge by (the light of) what Allah hath revealed they are (no better than) unbelievers.
*** In the verse above, the Quran asserts that the Jews were entrusted with protecting and preserving Allah's Book, the Torah, and there is no indication given here that they failed that trust especially since it was because they had done so that Muhammad was able to bring about the Quran as a scripture to his own pagan people.
Since the followers of Muhammad are certain that the People of the Book had deliberately corrupted their Books, then the onus is on them to show the original uncorrupted ones upon which they base their purile and unsubstantiated allegations ***
6: 91No just estimate of Allah do they make when they say: "Nothing doth Allah send down to man (by way of revelation)": Say: "Who then sent down the Book which Moses brought? a light and guidance to man: but ye make it into (separate) sheets for show while ye conceal much (of its contents): therein were ye taught that which ye knew not neither ye nor your fathers." Say: "Allah (sent it down)": then leave them to plunge in vain discourse and trifling.
6:92And this is a Book which We have revealed bringing blessings and confirming (the revelations) which came before it: that thou mayest warn the Mother of Cities and all around her. Those who believe in the Hereafter believe in this (Book) and they are constant in guarding their prayers.
*** It would defy logic and intellect to believe that the Quran would use 'corrupted' Books as confirmation of its own authenticity.
No where does the QuranEVER imply that the TEXTS of the Scriptures of the People pf the Book had been tampered with or CORRUPTED.
Since this is the case, then any alleged corruptions would have happened AFTER the Quranic'revelations'. If so, then the Muhammadan accusers have an unenviable intellectual, theological and historical MAGICAL ACT to perform:
1They have to prove the most STUPENDOUS and massive literary editing ever performed in the history of humanity; that the Jews and Christians were able to ALTER the TEXTS of EVERY single Book of theirs all over the world, in EVERY COUNTRY, in all the languages that the Bible was written in, with the consent, agreement and collusion of all the Jewish Rabbis as well as all the Christian priests, without leaving a copy of any ORIGINAL BIBLE.
2To believe that the Jews and Christians were able to accomplish all the above without leaving a single trace of such a CONSPIRACY, requires a human mind and INTELLECT that also believes in FLYINGelephants and that the Moon is made of cheese.
3The ONUS is upon the followers of Muhammad to prove their case by showing mankind a SINGLE ORIGINAL UNCORRUPTED BIBLE upon which they can rest their Fallacious, Insane, Contemptible and Ignoramous allegations ***